The wooden box is actually a homemade device for doing polymerase chain reactions (PCR), a process that turns small samples of DNA into quantities large enough to analyze.

那个木箱子实际上就是一台自制的进行聚合酶链反应(PCR)设备。P CR是一个工艺过程，可以将DNA样本增殖到数量足够大，达到可以分析的程度。

youdao

These chemicals may speed one of the most fundamental reactions in genetic research, called polymerase chain reaction (PCR), by allowing scientists to perform it at higher temperatures.

FORBES: Invitrogen Deal Proves Diversa's Worth