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1.lead to 导致
A number have orbits that take them closer into the solar system that sometimes lead them to collide with Earth or the other inner planets.
有很多小行星的轨道可以把它们带到太阳系的更内层，有时甚至会使它们与地球或其它内行星相撞。
2.in herds 成群
Adult females and young travel in herds, while adult males generally travel alone or in groups of their own.
成年母象和小象会在群体中活动，然而成年公象一般会独自活动或者在他们的群体中。
3.a bunch of 一群
He responded instantly: as a bunch of ostriches with their heads in the sand.
他立刻答道：它们就像一群把头埋在沙子里的鸵鸟。
4.Or so 至少；大约
The typewriter remained in good condition after having been used for ten years or so.
这台打字机用了大约十年了，还这么好。
