Under the old system in America, a mother was supposed to stay home and take care of her children.

在美国旧的社会体制下，母亲应该待在家里照顾孩子。

youdao

While the swimmer's movements may be smooth and fluid, people have neither fins to stay afloat or generate speed, nor gills to deal with going under.

虽然游泳者的动作可能是平稳和流畅的，但人们既没有鳍来保持漂浮或产生速度，也没有鳃用于在水下呼吸。

youdao

Stay in a hotel? Don't be so soft. I want to camp out under the stars.

住旅馆？别那么贪图安逸了。我想顶着星星在野外过夜。

《牛津词典》

The older kind of submarine used in World War Two could stay under water for only about forty-eight hours.

VOA: special.2010.06.11

But then Micky gets one more chance in the ring,under one condition: his family has to stay out of his career.

VOA: special.2011.02.21

Engineers thought the new nuclear submarine would be able to stay under water for two weeks or more.

VOA: special.2010.06.11

Many developing countries have been arguing for a "twin track" approach, whereby countries with existing targets under the Kyoto Protocol (all developed nations except the US) stay under that umbrella, with the US and major developing economies making their carbon pledges under a new protocol.

BBC: Copenhagen climate summit negotiations 'suspended'

Westwood produced a solid one-under-par round to stay in contention at nine under par overall while fellow Englishman Paul Casey is a further shot back.

BBC: Ian Poulter moves into two-shot lead in Dubai

They encounter sudden combustion inside mock cabins, practicing ducking under flames to stay alive.

WSJ: Airplane Fires: Dallas-Fort Worth International Airport's Firefighter Training