The book also has a full answer key to all exercises.
这本书也有一个完整的答案主要向所有演习。
In a world full of locks, you're a key.
在这个充满锁的世界，你是一把钥匙。
Life is chock-full of fun, the key is taking the time to find it.
生活中充满了快乐，关键是花时间慢慢去发现快乐。
Make full use of national policy and seize hold of key customers.
充分利用好国家政策，全力冲击重点客户。
Make full use of national policy and seize hold of key customers.
充分利用好国家政策，全力冲击重点客户。
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