... litterbug 乱丢垃圾者 littermate 同窝出生仔畜 littery 杂乱的 ...
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littermate control 同窝对照
Methods:4 pairs of littermate swines were allocated randomly to 2 groups(the control group and the experimental group).
方法：选用同窝小猪4对，分别随机分为实验组和对照组。
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