开始认真的英文：
buckle down to

参考例句：
  • They've got the system down pat. He has the lesson pat.
    他们开始认真考虑这种制度。他对这课学得很快
  • When you really get down to it, the noise and distractions aren’t really obstacles at all.
    当你真正的开始认真考虑它的时候，嘈杂和干扰都不再是障碍。
  • If we all set to, we can finish cleaning the house in an hour.
    如果我们开始认真干起来,我们一小时就能把房间打扫乾净。
buckle是什么意思：
n. 皮带扣，搭扣
v. 扣住；（使）变形，弯曲
  • He buckled the strap on.
    他把皮带扣上。
  • The metal buckled in the great heat.
    这金属在高温下变形了。
  • The parachutist was buckled into his harness.
    跳伞者扣上了背带。
  • Belt buckle rash is a condition where skin reacts to the metal in a belt buckle.
    皮带搭扣皮疹是指皮肤对皮带搭扣上的金属产生的过敏反应。
  • A freak wave had buckled the deck.
    突然掀起的巨浪打弯了甲板。
down是什么意思：
prep. 在…下，沿着
v. 下降，打倒
n. 潦倒；羽绒；丘陵
  • Down with hegemonism!
    打倒霸权主义！
  • The sun is down.
    太阳下山了。
  • Close down autos and you close down steel and rubber.
    关掉了汽车工业你也就关掉了钢铁工业和橡胶工业。
  • nail down; nail in;hold by
    钉住;使人遵守诺言
  • break down resistance
    粉碎反抗，制服反抗

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