A laser is shot out, and then it's read by a detector, producing an almost perfect reading.
一束激光发出，被一个探测器接收，产生一个几乎完美的接收。
Detector: Field read before being initialized.
检测器：初始化之前读取字段。
This detector finds fields that are read in constructors before they're initialized.
这个检测器寻找在构造函数中初始化之前被读取的字段。
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