If both copies of chromosome 15 were derived from the mother, that means all the prader willi genes are methylated and silenced, since there's no unsilenced paternal genes.

如果15号染色体的两条同源染色体都来自母方，就意味着所有的普拉德-威利基因都被甲基化沉默，根本就没有父源基因的表达。

Upon hearing the gunshot from the commando's unsilenced rifle, the assault force fears that they've been given away, and the vehicles roar to the airport terminal at high speed.

听到突击队员未消音步枪的枪声， 突击部队担心他们已经被泄露，车辆以高速呼啸着驶向机场航站楼。