I lost a bunch of keys on the playground

钥匙───key

He proved overconfident on the witness stand, misremembering a key piece of evidence.───他在证人席上表现得过于自信，记错了一条重要的证据。

Two key witnesses at her trial committed perjury.───在对她的庭审中有两名主要证人犯了伪证罪.

The key doesn't fit the lock.───这把钥匙打不开这把锁。

He dived his hand into his pocket in an attempt to find the key.───他把手伸到口袋里摸,试图找到那把钥匙.

This piece changes key many times.───这首曲子有多处变调.

Scientists provided the key to understanding the genetic code that determines every bodily feature.───科学家们找到了破解决定各种身体特征的遗传密码的密钥。

If you turn the envelope upside down, the key will fall out.───你如果把信封倒过来, 钥匙就会掉出.

Give me the trunk key and I'll get the spare.───把行李箱的钥匙给我,我去拿一下备胎.

Inserting the key in the lock, he turned it and pulled the door open.───他把钥匙插进锁里转了一下,拉开了门.

He threw the key at me.───他把钥匙丢给我.