米尔先生做了个鬼脸。
The discovery at Sutter's Mill set off the historic California Gold Rush of 1848 and changed the face of America.
萨特磨坊里金矿的发现揭开了1848年加利福尼亚州淘金热的历史性一页，同时也改变了美国的面貌。
Tests are conducted to find the rules how such cutting parameters as cutting depth, cutting speed and feedrate per blade as well as the cutting angle affect on the life of face mill.
通过试验，找出了切削深度、切削速度、每齿进给量等切削用量及切出角影响面铣刀寿命的规律。
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