名词
中文翻译：Unknown
同义词：
['cow', 'mare', 'pregnant', 'give birth']
例句：
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1.The cow gave birth to a calf last week.
上周这头奶牛生下了一头小牛。
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2.The mare is pregnant with a foal.
这匹母马怀上了一匹小马。
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3. Pregnant women should avoid lifting heavy objects during their third trimester.
孕妇在第三个孕期应避免举重。