Her stockings were wrinkling at the knees.

她长袜的膝盖处起了皱褶。

《牛津词典》

His sudden smile made her go weak at the knees.

他突然笑了笑，使得她两膝发软。

《牛津词典》

Remember when lifting a backpack, or anything, to lift using the arms and legs and to bend at the knees.

记住，当提起背包或其他东西时，要用胳膊和腿提起，膝盖弯曲。

youdao

She was nine years old at the time. She remembers her mother on her knees, begging French police to take her but to spare her children.

VOA: standard.2010.04.10

If you're an oil rich country today, as long as that oil lasts, you got the world kind of at your knees.

如果你今天是富油国,并且能保持稳定的产油量,那整个世界都会匍匐在你的跟前

耶鲁公开课 - 美国内战与重建课程节选

He repositioned his hands, dipped down at the knees, and flipped the weight up beneath his chin.

NEWYORKER: The Strongest Man in the World

Palm licensed its operating system to Nokia and Handspring, cutting Microsoft Windows CE off at the knees.

FORBES: Fat, florid, farcical

"They could have cut us off at the knees, just like the Swiss, " he is quoted as saying.

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