He's such a workaholic that he doesn't know how to spend his leisure time.
他是个工作狂,以至于不懂得如何打发他的空闲时间。
Birds of a feather flock together.
物以类聚,人以群分。
It is true that during their explorations they often faced difficulties and dangers of the most perilous nature, equipped in a manner with would make a modern climber shudder at the thought,