复数： investigations

A federal investigation is also under way .

联邦机构的调查也在展开。

A few others look worthy of further investigation .

另一少部分貌似值得进一步研究。

But police widened their investigation following reports of other missing teenagers in the area .

但是警方根据当地失踪青少年的报告，把他们的侦查范围进一步扩大了。

If the investigation lasts long enough , even an honest official 's career prospects will be destroyed .

如果审查拖得很长，哪怕是廉洁的官员，仕途也会毁于一旦。

The investigation was effectively dropped .

调查到此实质上被中断。