One's ears are more attuned to sounds in the darker hours – the very occasional shriek of a shearwater, the other sounds with no known cause.
在黑暗中，人的耳朵会对声音更敏感——偶尔有海鸥发出尖利的叫声，还有各种来路不明的声音。
2
An occasional short ride is unlikely to cause trouble.
偶尔一次短途骑车不大可能造成麻烦。
3
It can also be linked to the ship's radar, for greater accuracy, though the fact that the laser does not cause permanent damage means that occasional mis-targeting will not matter too much.