Tracing and following up people who may have been exposed to Ebola through close contact with patients are essential.

追踪并持续关注可能通过密切接触病人而接触埃博拉的人非常重要。

youdao

The Sahara hindered human contact with the north for too many centuries, so that Africa was little exposed to the great Mediterranean civilizations.

撒哈拉大沙漠阻断了人们与北方的联系，太多个世纪以来都是如此，以致非洲根本无法接触到伟大的地中海文明。

youdao

If you think you've been exposed to HIV, contact your doctor immediately.

如果你觉得你已经接触到艾滋病毒，立即联系你的医生。

youdao

Yeah, so for example, you get exposed to-- before there was a vaccine your brother or sister had chickenpox, and so you got exposed to chickenpox naturally through your contact with them.

举个例子来说,如果你生活在这样的环境里,兄弟姐妹们还没接种疫苗就得了水痘,而你通过与他们相接触,在自然情况下接触到了水痘病毒

耶鲁公开课 - 生物医学工程探索课程节选

You're exposed to the bacteria that cause impetigo when you come into contact with the sores of someone who's infected or with items they've touched, such as clothing, bed linen, towels and even toys.

CNN: Impetigo

The new test was trialled on 50 healthy volunteers who attended a contact-tracing clinic in London after having been exposed to TB in varying degrees.

BBC: More accurate TB test unveiled