Rats can also make baby rats very quickly.
老鼠们生育小老鼠的速度也很快。
I am taking these rats home, but you can visit these rats anytime.
我要把这些大鼠拿回家去，但是你任何时候都可以来我家看这些大鼠。
The pain threshold dropped in the male rats and rose in the female rats.
结果雄性老鼠的疼痛阈值下降而雌性老鼠上升。
The pain threshold dropped in the male rats and rose in the female rats.
结果雄性老鼠的疼痛阈值下降而雌性老鼠上升。
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