帮我用英文翻译一下这句话，很简单的

来源：百度知道 编辑：UC知道 时间：2024/09/28 08:51:31
内容是：这个小偷先藏在飞机里，趁监管人员不备时，用事先准备的沙子和石头把钻石调包了，然后再带着钻石跳伞而下.
要自己翻译，不要电脑上的自动翻译！！不要电脑上的自动翻译！！

This thief hides first in the airplane, while when supervises and manages the personnel unprepared, with the sand and the stone which prepares beforehand the diamond have made a fraudulent switch, then is having the diamond parachuting again under.

The first thief in possession of the aircraft, while the regulators are not prepared, prepared with sand and stone to the diamond switching, and then parachuting down with a diamond.

这个是新概念Ⅰ上面的一片，关于diamond的一篇，你去自己找。