单词：roll barrel
roll barrel的用法和样例：
例句
- The roll barrels are mainl composed of pearlitic or temper sorbite in the microstruscutre.辊身金相组织为珠光体或回火索氏体。
- Propagation develops within the working surface of the roll, gradually increasing in depth and width followed by a large surface spall of the overlying barrel surface.这种断裂首先是在工作层中产生的，进而逐渐往辊身方向变深变宽，最终导致辊身大面积的剥落。
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