Excavation follows preparation of the site, and is performed when the existing grade must be brought down to a new elevation.

首先要挖掘及处置土方，其后是平整场地，原先的坡度必须减缓至新的仰角。

youdao

One way oranother, the new sticker—whether based on a letter grade or some variation ofthe existing label—has to be ready for the 2012 model year.

不管是基于字母分级，还是现有标签的变种，新标签必须要在2012产品年能够投入使用。

youdao

The breaking of very few bolts and loosening of nuts existing in the present operation of 10 Grade BY Type check nuts are analyzed and discussed.

对10级BY型防松螺母当前运用中存在的个别螺栓折断和螺母松动问题进行了分析探讨，并提出了相应的措施与建议。

youdao

Friday,Tehran delayed its response to a proposal made by the US, France and Russia to further enrich Tehran's existing stockpile of low-grade uranium.

VOA: standard.2009.10.24

The decline was primarily due to the mining of lower grade ores in the existing mines.

FORBES: Newmont Shines To $76 With Gold Price Going Parabolic

The so-called Khalil Gibran International Academy (KGIA) will start small a single sixth-grade class lodged temporarily inside an existing public school in Brooklyn.

CENTERFORSECURITYPOLICY: War of Ideas on the homefront

What if we could build a nuclear reactor that offered no possibility of a meltdown, generated its power inexpensively, created no weapons-grade by-products, and burnt up existing high-level waste as well as old nuclear weapon stockpiles?

FORBES: Is Thorium the Biggest Energy Breakthrough Since Fire? Possibly.