例句與造句

1. In contrast , the researchers did not find the mutation when they analyzed large comparison populations of iranians and americans
   相反的是，研究人員在他們對美國人和伊朗人進(jìn)行大規(guī)模人口對比分析中仍然沒有發(fā)現(xiàn)突變。
2. It's difficult to find comparison population in a sentence. 用comparison population造句挺難的