part 5 ; 写完答案之后通读一篇，顺不顺；
正确率永远比速度更重要；
閲讀原文找到依据、根据~；空格相关的往往在空格后一句里面；
同位语、插入语；
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advising customers both on the type of seal to buy and on the correct way to operaye their
plants so that sealing costs are reduced.
ambiguity
ambiguous;
account for.... （数据的）占比...，...的原因、；
not only.....but also....;
spelling out 拼写出来，说出了；
in return 作为回报；
both...and...
until now 直到现在，为止;
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