He makes his own paint, grinding up the pigment with a little oil.
他把色料块加少许油磨碎，自己制成绘画颜料。
They also lost the grinding molars that brown bears use to chew up plant matter.
它们也失去了棕熊用来咀嚼植物性食物所用的臼齿。
A truck came grinding up the hill.
一辆卡车嘎嘎响地慢慢驶上山。
The train was grinding its way up a mountain.
火车嘎吱嘎吱爬上山。
The train was grinding its way up a mountain.
火车嘎吱嘎吱爬上山。
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