When the immune system "sees" them, it will try to kill them.
当免疫系统“看到”它们时，就会试图杀死它们。
He must watch at all times for wolves, and other animals who try to kill the sheep.
他必须时刻地警戒著有没有狼，或者其它会伤害羊的野兽。
He must watch at all times for wolves, and other animals who try to kill the sheep.
他必须时刻地警戒著有没有狼，或者其它会伤害羊的野兽。
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