重点讲解：
1. used to do sth. 过去常常；过去曾；
例句：There
used to be a horde of startups trying to enter this market but the energy is largely gone.
过去有一堆小公司试图加入这个市场，但现在那股活力没有了。
2. catch up with 了解近况；叙旧；
例句：The survey revealed two thirds of women felt guilty as they did not
catch up with their friends often enough.
调查揭示，三分之二的女性因为没能和朋友经常联系而感到内疚。
3. at least （表示相对于不利条件或糟糕情形）起码，不管怎样；
例句：This
at least shows that some people in the music industry is still quite a sense of humor.
这至少证明，在音乐行业有的人还是颇具幽默感的。
4. be in touch with (与…)联络；(与…)联系；
例句：I realized that Twitter was a very nice way to
be in touch with your fans as well as inspire people who are going through tough times.
我觉得twitter是与粉丝们保持联系的一个很好的途径，而且也很便于鼓励那些有困难的人们。
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