The Supreme Court upheld President Barack Obama's healthcare law on Thursday in an election-year triumph for him and fellow Democrats who championed the most sweeping overhaul since the 1960s of the unwieldy U.S. healthcare system.

The Supreme Court：联邦最高法院

In a 5-4 ruling based on the power of Congress to impose taxes, the nation's highest court preserved the law's "individual mandate" requiring that most Americans obtain health insurance by 2014 or pay a tax. The justices also preserved, with some changes, a provision of the law expanding the Medicaid health insurance program for the poor.

The decision - written by conservative Chief Justice John Roberts and joined by the court's four liberals - was a setback for Republicans who mounted unified opposition in Congress to the law before its 2010 passage and who deride it as meddling in the lives of individuals and in the business of the states.

Republicans：共和党人

meddling in：干涉

Obama and Mitt Romney, the Republican challenger in the November 6 presidential election, immediately responded, with the president calling the ruling "a victory for people all over this country whose lives will be more secure because of this law and the Supreme Court's decision to uphold it."

"We will continue to implement this law and we'll work together to improve on it," said Obama, speaking somberly in the White House East Room, the same setting he used to announce the 2011 death of al Qaeda leader Osama bin Laden.

improve on：改进

al Qaeda：基地组织

"What we won't do - what the country can't afford to do - is re-fight the political battles of two years ago or go back to the way things were. With today's announcement, it's time for us to move forward," Obama added.

Romney, who pushed through a similar healthcare overhaul at the state level in 2006 as governor of Massachusetts but opposed Obama's law, called on voters to help him defeat the president in order to repeal the law critics derisively call "Obamacare."

called on：呼吁

"If we're going get rid of 'Obamacare' we're going to have to replace President Obama. My mission is to make sure we do exactly that," Romney said on the roof of a building overlooking the U.S. Capitol.

The healthcare law, known formally as the Patient Protection and Affordable Care Act, is the biggest overhaul of the $2.6 trillion healthcare system in about 50 years. It was signed by Obama in March 2010 and promptly put to the test in the courts by 26 of the 50 states and a trade group for small businesses.

Patient Protection and Affordable Care Act：病人保障及负担得起的医疗法案

the biggest overhaul of：最大的改革

The court's decision largely vindicates Obama and Democratic lawmakers in their attempt to fix a system that, while representing 18 percent of the economy, leaves 16 percent of Americans uninsured, a fact that sets the United States apart in the industrialized world.

attempt to：尝试做……

The U.S. system, unlike other rich countries, is a patchwork of private insurance and restrictive government programs. The United States pays more for healthcare than any other country, but about 50 million of the roughly 310 million Americans still have no insurance at all.

The Obama law was meant to bring coverage to more than 30 million of the uninsured and slow soaring medical costs.

slow soaring medical costs：放慢医疗成本飙升速度

Roberts was joined by liberal Justices Ruth Bader Ginsburg, Stephen Breyer, Sonia Sotomayor and Elena Kagan in upholding the law's pivotal "individual mandate" provision.

The four dissenters, all from the court's conservative wing - Justices Antonin Scalia, Anthony Kennedy, Clarence Thomas and Samuel Alito, took the unusual step of issuing one joint opinion and said they would have struck down the entire law.

conservative wing：保守人士

struck down：击倒

Kennedy, summarizing the dissent from the bench, accused the court majority of "vast judicial overreaching. It creates a debilitated, inoperable version of healthcare regulation that Congress did not enact and the public does not expect."

dissent from：与……意见不同

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