The first step to grow rice is preparing the land. It must be level.

种植水稻的第一步是准备好土地。它必须是平坦的。

youdao

A table top must be level.

桌子面一定要平。

youdao

For example, a pond in hilly country that maintains a steady water level all through a dry summer in spite of having no streams flowing into it must obviously be seepage dominated.

例如，在丘陵地区的一个池塘，尽管没有小溪流入但在整个干燥的夏季保持稳定的水位，显然一定是以渗流为主。

youdao

Services must be shaped to fit each country's health care needs and level of technological development.

VOA: special.2009.06.17

If you want to have high level of creativity, it's a must you have to be depressed.

如果你想拥有更高水平的创造力，必须承受抑郁。

哈佛公开课 - 幸福课课程节选

Mister Quinn says efforts to combat the problem must also be increased at the community level.

VOA: special.2010.05.17

And if you want to catch white collar criminals, there must be some level of intrusiveness by investigators, prosecutors and regulators.

FORBES: Is the Current Wave of Insider Trading Cases a Deterrent to Others?

Art must reflect gameplay, which must reflect the theme, that must be reflected on level design.

FORBES: 'Journey' Review: Making Video Games Beautiful

Candidates must be female postdoctoral level researchers who have already been awarded their research doctorate in the fields of life or physical science.

UNESCO: UK National Commission for UNESCO :: UK and Ireland National Fellowships