Every autumn, China frets that once again it hasn’t produced a Nobel laureate.

每年秋天，中国会因为再一次没有产生诺贝尔奖获得者而烦恼。

While a person admires their beauty or frets about how much extra weight they put on over Christmas, the mirror displays their temperature and an alarm sounds if they are deemed feverish。

当你对镜欣赏容貌，或者为圣诞节长胖了不少而烦恼时，“体温镜”就可以显示出你的体温，如果发烧还会发出警报。

While a person admires their beauty or frets about how much extra weight they put on over Christmas, the mirror displays their temperature and an alarm sounds if they are deemed feverish.

当你对镜欣赏容貌，或者为圣诞节长胖了不少而烦恼时，“体温镜”就可以显示出你的体温，如果发烧还会发出警报。

Baby frets in hot weather.

天热时，婴儿烦躁。

Baby frets in hot weather .

天热时，婴儿烦躁。

She frets about the weather.

还在苦恼该死的天气

She frets at even the slightest delays.

稍有延误她就不满。

That struts and frets his hour upon the stage

在舞台上，一会趾高气扬、一会焦躁不安

The BIS frets that this has encouraged excessive credit growth.

令国际清算银行苦恼的是,这助长了过度的信贷增长.

Frets about the legal implications of using statistical correlations.

担心使用统计相关（可能引起）的法律后果（法律牵连？）