“流行病给全球带来两次甚至三次流行浪潮的趋势将进一步影响到该流行病的总体严重性。”WHO在一份声明中说。

"The overall severity of a pandemic is further influenced by the tendency of pandemics to encircle the globe in at least two, sometimes three, waves," WHO said in a statement.

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一种流行的时尚只是在短时期内流行，伴随着新的流行时尚产生，就会很快被人们置于遗忘的角落。

A fad is popular for only a short time and is forgotten as soon as the next fad comes along.

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由于这些疾病常常以流行病形式出现，虽然流行期之间的持续免疫接种很有挑战性，但他们通常比国家本地流行更加重要。

Because these diseases can present as epidemics, they are often a priority for endemic countries, although sustaining immunization in between epidemics can be challenging.

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So the sense that one actually is pretty adept in knowing is one that tends to predominate in the university.

因此在大学中，认为自己了解很多,这种心态颇为流行。

普林斯顿公开课 - 人性课程节选

The way he did a lot of prints and you know, famous, like celebrities and pop, like basically the pop art,

他的画，是很有名的，就像社会名流和流行音乐，基本上是流行艺术，

学生们的艺术热情 - SpeakingMax英语口语达人

It's a pretty state of affairs, in his view, when the most rigorous thinking that's being done about literature is being done in popular journals.

他认为，关于文学的严肃的思考大多,被发表在流行杂志上很不妥当。

耶鲁公开课 - 文学理论导论课程节选