正文

VOA慢速英语:Scientists Use Sound Waves to Find Hidden Cracks in Bridges, Airplanes

2015-04-13来源:VOA

Update Required To play the media you will need to either update your browser to a recent version or update your Flash plugin.

词汇讲解：

1. discover vt.发现; 碰见
例句：You shall not discover it to any person in the world.
你不要向世上任何人道破这件事。

2. involve vt.包含; 使参与，牵涉
例句：The love needs involve both giving and receiving love.
爱情的需要包括给与爱和接受爱两个方面。

3. identify vt.识别，认出
例句：Can you identify your brother in this picture?
你能在这张照片上认出你哥哥吗？

4. estimate vt.估计，估算
例句：Can you estimate its length/how long it is?
你能估计其长度[它有多长]吗?

5. replace vt.替换; 代替
例句：We undertake to replace any product not up to the specifications.
产品不合规格，保证退换。