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重点讲解：
1. have problems (in) doing sth.
固定搭配；表示“做某事有困难”；
eg. The company has problems in servicing its debt.
该公司在支付债息方面有问题。
eg. Many people have problems getting to sleep at night.
很多人晚上难以入睡。
2. drain away
（使）流走[去]；（使）减弱；排出；
eg. We dug trenches to drain away the dirty water.
我们开沟排去污水。
eg. If they do not want margins to drain away, operators must find ways to enhance and differentiate their offerings.
如果不希望利润流失，运营商们必须找到办法提高产品质量，增加产品种类。
3. make sure
一定要；设法保证；
eg. Make sure the firm is competent to carry out the work.
要确保这家公司有能力完成这项工作。
eg. She looked behind her to make sure that she was not being followed.
她回头看了身后确定没人跟踪她。
4. cut away
切掉；切除；
eg. The surgeon cut away the tumor with expert skill.
外科大夫以熟练的技术把肿瘤割掉。
eg. We must cut away the diseased branches from the trees.
我们得把有病害的树枝剪除。
vt. 提高，加强，增加
