Krebs investigated experimental plots in Canada's Yukon territory that contained hare populations.

克雷布斯调查了加拿大育空地区含有野兔种群的试验田。

youdao

Krebs has discovered that great blue herons look up more often when in smaller flocks than when in larger ones, solely as a consequence of poor feeding conditions.

克雷布斯发现，大蓝鹭在较小的群体中比在较大的群体中更容易抬头，这完全是由于恶劣的饲养条件造成的。

youdao

Krebs hypothesizes that the herons in smaller flocks are watching for herons that they might follow to better feeding pools, which usually attract larger numbers of the birds.

克雷布斯假设，小群的苍鹭是在观察，它们可能会跟随被观察的苍鹭去更好的觅食池，那里通常会吸引更多的鸟类。

youdao

Michelle Krebs at online auto advisor Edmunds.com called the sales freeze "unprecedented."

VOA: standard.2010.01.28

Decide what is the most important thing to discuss with your doctor, advises Krebs.

CNN: Cranky doctor or annoying patient? Sometimes it's both

There are certain situations where patient and doctor just aren't a good match, according to Krebs.

CNN: Cranky doctor or annoying patient? Sometimes it's both

You should "take Internet research and advertising with a grain of salt, " adds Krebs.

CNN: Cranky doctor or annoying patient? Sometimes it's both