have learned;

They never learned skills to engage the attention of the others.
他们从未学过吸引他人注意的技巧。
来源:《柯林斯高阶英汉双解学习词典》Miss Su said , " Hung-chien, you studied philosophy, didn't you? "
苏小姐道: “ 鸿 渐, 你学过哲学, 是不是? ”
来源:汉英文学 - 围城Although not essential, some prior knowledge of statistics is desirable.
统计学的知识虽非必要,但最好是学过一点。
来源:《牛津高阶英汉双解词典》I learned something about writing. The secret is to say less than you need.
我学过一点写作方面的技巧,秘诀就是欲说还休。
来源:《柯林斯高阶英汉双解学习词典》
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