The benefits are hard to detect.
其好处却很难被察觉。
Unfortunately, they are hard to detect.
不过遗憾的是，观测它们相当困难。
Even then, the invaders are hard to detect.
即使如此，这些入侵者仍难以觉察。
It USES the power of being small and hence hard to detect or control.
这种微型力量使得探测和控制变得异常艰难。
Site send patrols every night, but the thief is still very hard to detect.
工地每天晚上都派人巡逻，但是小偷还是防不胜防。
Site send patrols every night, but the thief is still very hard to detect.
工地每天晚上都派人巡逻，但是小偷还是防不胜防。
应用推荐