To determine the catenary curves of arches, he would tack a sketch of a foundation plan on the ceiling, hang loops of string, and attach weights along the loops in proportion to down forces.

为了确定拱顶的链状曲线，他会用大头针将基座草稿钉到天花板上，吊上几圈绳子，在绳子上加重，与向下的力相符。

youdao

Toss in a couple of short YouTube videos and small app updates, and I hit the 250MB ceiling in just three days after activating my month-to-month plan.

浏览了YouTube几个短短的视频，更新了几个小小的应用程序后，我在开通按月付费套餐的第三天就用完了250MB.

youdao

The house features an open plan of public Spaces on the main level, all connected by a floating cedar ceiling that extends into the outdoor space.

该别墅特色在于主要层面公共空间开敞布置，通过延伸到户外的浮式雪松天花板连接起来。

youdao

The U.S. federal debt ceiling and a plan for dealing with the U.S. federal deficit were cited by the largest number of respondents.

FORBES: What Economic Catalysts Are Investors Seeking?

You know the examples: the debt ceiling debate, the job plan, food safety regulations, etc.

FORBES: Are We Living Up to "The Pledge?"

Obama, who rejects any negotiations over the debt ceiling, has welcomed the House plan as a step forward because it prevents immediate brinksmanship over whether the government will meet its financial obligations.

CNN: January 23, 2013 -- Updated 1714 GMT (0114 HKT)