许多警察署都有个规定,要求预备警员无犯罪前科.
来源:网络文摘精选The man was known to the police because of previous convictions.
因为有犯罪前科,警察们都认识这个人。
来源:《柯林斯高阶英汉双解学习词典》Although he subsequently became a successful businessman, his criminal past caught up with him.
尽管后来他成了事业有成的生意人,以前的犯罪前科终究让他尝到了苦果。
来源:《柯林斯高阶英汉双解学习词典》Previously, scientists thought only small mammals and harbored brown fat.
之前, 科学家们认为只有小的哺乳动物和新生儿拥有灰色脂肪.
来源:互联网摘选赫尔方博士称目前科学家正着手追踪那些能给地球带来潜在威胁的大型太空岩石.
来源:网络文摘精选Until recently, scientists were unable to make full use of antibody power.
直到目前, 科学家们还不能充分利用抗体的力量.
来源:词典精选例句
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