key

• The key material is amply strong .
  键材料的强度足够。
• Is capital formation the key to economic development ?
  资本形成是经济发展的关键吗？
• Education is one of the key words of our time .
  教育是我们这个时代的关键性字眼之一。
• Give me your keys , please . let me open the door for you .
  请给我钥匙，我替你开门。
• I can not get in -- i have lost the perishing key !
  我进不去我把该死的钥匙丢了。
• A safe must have a key .
  一个保险箱一定有一把钥匙。
• Keys do not offer descriptions of the plants concerned .
  检索表不提供有关植物的描述。
• The used key is always bright .
  常用的钥匙永不生锈
• They have always believed deeply that incentives are key .
  他们一向深信物质刺激是关键。
• Oh , no ! i 've forgotten my key again .
  真该死！