They are usually white or yellow centrally, but may be red if they also contain blood.

脓疱常呈白色或黄色或中央为黄色，如果混有血液则为红色。

youdao

Some of them emit sounds (usually white noise or a variant) in an effort to mask distracting noises.

其中一些发出的声音(通常是白噪音或者是变异体)是为了掩盖分心所用的噪音。

youdao

In the early Disney cartoon movies, princesses like Snow White, Cinderella and Aurora from Sleeping Beauty are usually good looking and kind hearted.

在早期的迪斯尼卡通电影中，像白雪公主、灰姑娘和睡美人中的奥罗拉这样的公主通常都很漂亮，心地善良。

youdao

Usually,white publishers paid only a small amount of money for full ownership of music written by African-Americans.

VOA: special.2010.01.24

They usually won. Some plains Indians tried to live peacefully with the white men.

VOA: special.2010.04.01

Mississippi also passed a law saying a black person could be forced to work for a white man usually his former owner if he had no other job.

VOA: special.2010.01.21

In people of African descent, the skin may be light brown, and in those of Asian or Northern European descent, the skin is usually white.

CNN: Albinism

Over 95% of adult Kuwaitis work for the government, usually in white-collar civil-service jobs.

ECONOMIST: Beyond Wisteria Lane

Boeing seems distracted by its recent merger binge and a surprising strike by usually tractable white-collar engineers.

ECONOMIST: Troubled cities 2