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雷达卡
原文标题：
Ageing reversal: scientists rejuvenaye tissues in middle-aged mice 科学家新疗法让中年老鼠“重返青春”
每日英语：
1 you could cut the atmosphere with a knife
英文释义：
used to say that the emotional tension,
embarrassment,etc. shared by a group of people is very great
气氛非常紧张；局面非常尴尬；剑拔弩张
例句：
When John came in with his new girlfriend,you could have cut the atmosphere with a knife.
约翰带着新女友进来时，气氛极其紧张。
2 take attendance
英文释义：
check who is present and who is not present at a place and mark this information on a list of names点名
例句：
The teacher took attendance at the beginning of every class.
每次一上课老师都要点名。
3 have sth on good authority
英文释义：
be able to believe sth because you trust the person who gave you the information
有可靠的根据相信
例句：
I have it on good authority that the chairman is going to resign.
董事长要辞职了，我这个消息是有根有据的。
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