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重点讲解：
1. a great deal of 许多；大量；
They spent a great deal of money.
他们花了大量的钱。
2. pick out 辨认出；分辨出；
The detective-constable picked out the words with difficulty.
探警费力地辨认出这些文字。
3. differentiate between 区分；区别；辨别；
A child may not differentiate between his imagination and the real world.
儿童可能无法将自己的幻想与真实世界区分开来。
4. think twice 重新考虑；慎重考虑；思忖再三；
Think twice before doing anything rash.
不要草率行事，要三思而行。
n. 气味，名声，气息
