在大多数塑料包装的底部都有一个小三角形，里面写着一个字母或数字。
On the bottom of most plastic packaging, there's a small triangle with a letter or a number written inside.
角上的数字同样是在三角形带中使用的索引。
The Numbers at the corners are again the indices used in the triangle strip.
当汽车在开行当中时，跟踪设备用三个或四个GPS卫星以三角形定位，然后持续地通过无线电数字传输目标所在的坐标位置。
As the target drives around, the tracking device triangulates its position from three or four GPS satellites, and digitally transmits its coordinates continuously by radio.
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