Some of the machine tools are so small that they can be moved by hand. Others arc so big that they weigh 100 tons or more.

有些机床很小，用手就可以搬动；另外一些则很大，重达100吨或100吨以上。

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When floating in water, persons or other heavy objects are forbidden to weigh on the machine.

本机浮于水中时严禁人员及其它重物压于机器上。

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Professor:I'm going to weigh myself on this weighing machine.

伯菲教授： 就在这个磅秤上称。

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And, oh yeah, the machine can't weigh a lot or be too bulky.

FORBES: Running in place

Unlike the V5, this machine boasts an optical drive, but it does weigh a heftier 4.79 pounds.

ENGADGET: Acer Aspire V5 review: an 11-inch Ivy Bridge laptop for $550