你必须花些时间查一查这些寻求帮助的团体，以确保它们是合法的非营利性组织。
You must take the time to investigate the groups behind such pleas for help to ensure that it comes from a legitimate nonprofit.
该研究突出反映了在代表性研究中如何“验证”一项技术的问题，这可能比筛查人群和适于调查更具有代表性。
This study highlights the problem of "validating" a technique in a cross-sectional study that may be more representative of a screening population and appropriate to investigate.
奶妈于是过去查个究竟。当她来到那只船时，首先看到的竟是一滩鲜血。
The wet nurse went over to investigate. When she reached the other boat, the first thing she saw was a pool of blood!
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