1.familiar with 熟悉的

Most people are familiar with this figure from Wagner's opera.
多数人都熟悉瓦格纳歌剧中的这一人物。

2.for the better 好转

Our 10-page guide will help you to change your life for the better.
我们这本10页的指南有助于您提高生活品质。

3.a number of 一些

Two significant constants have been found in a number of research studies.
若干研究已经发现了两个重要常量。

4.in practice 实际

This is certainly a theoretical risk but in practice there is seldom a problem
从理论上讲，这肯定是有风险的，可是实际上很少出问题。

5.be worthy of 值得

They regard the problem as not worthy of serious consideration.
对这一问题他们都认为不屑一顾。
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