严t的息者，炎症可波及咽鼓管，出现耳鸣或听力减退的症状。

Yan t the rest, the inflammation may affect the eustachian tube, has symptom which the tinnitus or the hearing drop.

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购买时，应选择规模大，管理严的企业的产品，可保证产品的质量和良好的售后服务。

Customers had better choose a big scale coporation with strict management, because it can promise it's product's quality and service.

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哲学的理解可宽可严。

Philosophy can be understood loosely or strictly.

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