他将刮水控制器放置在一个红色的金属盒子里，上面写道 “工程测试专用，切勿打开。”。
He put his wiper control in a red metal box that on the outside had the words "For Engineering Tests Only. Do Not Open.".
你如何能仅从外观看出这样一个小金属盒子能干什么？
How could you be expected to guess what that tiny metal box does by looking at it?
她的验电器是一个金属盒子，旁边有两个小孔。
Her electroscope was a metal case with two holes in its side.
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