break in grade

基本解释

He did not break his arm in the third grade.
他也沒有在三年級的時候手腕骨折。
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Play Musical Chairs at Meetings – Break out of the foolish grade school habit of continually sitting in the same seat.
在會議室擺放音樂椅 – 打破愚蠢的連續坐在同個地方的高中習慣。
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.
輕量塗佈紙是儅今世界推崇的新産品。對原紙強度要求相對降低、不易産生斷紙的輥式塗佈方式，已是世界造紙發展的主流。

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