There are risks, and researchers have reported that some people get little or no protection from aspirin.

VOA: special.2009.10.20

Then they test you to make sure that you have adequate protection, and some people need an additional shot after that.

然后医生会检测以确定你已获得了保护,有些人在测试完后需要再打一针

耶鲁公开课 - 生物医学工程探索课程节选

If I happen to have some other infectious disease, then not only would you passing the protection to smallpox, but you'd be passing that disease among the population as well.

如果正好还有其他传染病,那不仅会传播对天花的免疫能力,也在人群中传播其它传染病

耶鲁公开课 - 生物医学工程探索课程节选

Some insects build cocoons around themselves for protection while they grow and change.

VOA: special.2010.03.28

Some scientists support the idea of historical protection for the remaining objects.

VOA: special.2010.03.02

Some newspaper companies have recently sought bankruptcy protection.

VOA: special.2009.03.21

The soldiers and marines quickly realized the light-weight Humvees did not have enough protection against the bombs, so they added some armor.

VOA: standard.2009.11.02