break in grade

基本解释

He did not break his arm in the third grade.
他也没有在三年级的时候手腕骨折。
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Play Musical Chairs at Meetings – Break out of the foolish grade school habit of continually sitting in the same seat.
在会议室摆放音乐椅 – 打破愚蠢的连续坐在同个地方的高中习惯。
The light - weigh coated (LWC) pape is a new grade in the world, Roll Coating that requires relatively no high base paper strength, and isn' t apt to break, has become main current.
轻量涂布纸是当今世界推崇的新产品。对原纸强度要求相对降低、不易产生断纸的辊式涂布方式，已是世界造纸发展的主流。

Both involve heating organic materials in a vacuum until they break down into carbon and vapors that can be condensed into a low-grade fuel oil.
FORBES: KissyKat And The Magic Diesel