174　Chief Diagnostic Tool 主要诊断工具

While waiting for my car, I saw a Magic Ball on the mechanic's desk. I turned it upside down and read: “Fan belt.” I shook it again. “Battery,” it said. The mechanic walked in. “That,” he said, “is our chief diagnostic tool.”
在等着修车的时候，我在修理工的桌子上看到一个魔球。我把它倒过来放，出来的字是“风扇皮带”。我又把它摇一摇，出来的字是“电瓶”。这时，修理工进来了。他说：“这是我们主要的诊断工具。”