声音在水下传播的很好，但是有一些声音从空气中传到水中却有一定的困难。为什么是元音能很好的传播而不是辅音呢？ Hints: None 选材／校对／翻译：hqj5715Every spoken sound is actually a combination o...

你是否曾经思考过为什么鸟儿不会被通过高压线的电流电击吗？ Hints: None 选材／校对／翻译：hqj5715It's not unusual to see rows of birds perched on power lines. But did you ever wonder why birds a...

你是否曾经思考过为什么鸟儿不会被通过高压线的电流电击吗？ Hints: None 选材／校对／翻译：hqj5715It's not unusual to see rows of birds perched on power lines. But did you ever wonder why b

冰箱所能做的只是转移热量或者说能量，从一个地方转移到另外一个地方。 Hints: None 选材／校对／翻译：hqj5715Turn on your oven, and you'll warm up the kitchen. With the oven door open, the kitche...

Joe和Susan在森林中迷路需要大喊求救。他们两个谁的声音传播的距离更远更容易被听到？ Hints: None 选材／校对／翻译：hqj5715During their church choir's annual picnic, Joe and Susan wandered off to ...

Snakes are misunderstood. They’re not slimy. They’re not ___1___ by music. And the poisonous ones don’t all ___2___ venom into their prey through hollow needlelike fangs. In fact, the fangs of...

存在于轮船行驶过后的物理与科学现象。 Hints: None 选材／校对／翻译：hqj5715The wake starts out smooth because the passage of the ship destroys whatever wave patterns were there before the shi...

厨房烧水时经常会看到白气，我们称翻滚的“白气”为“混合云”。两种温度、含水量不同的云团混合就可以产生。比如，壶嘴中喷出的高温水蒸气遇到厨房空气，迅速冷却，至少水蒸气凝结。Fill a kettle with water,...

本听力主要讲的是平抛运动，难点单词不多，语速较快。理解大意后听写会事半功倍。Don’t Try This at Home! Here’s a hypothetical scenario that is to remain hypothetical. In other words, don’t do t...

一群伟大的科学家去世后在天堂里玩藏猫猫。轮到爱因斯坦抓人，他数到100睁开眼睛，看到所有的人都藏起来了，只有牛顿还站在那里。A bunch of great, DEAD scien...