之前提到过 has been mentioned before
之前没有提到过 has not been mentioned before
提前支付强度过程 prepayment intensity process
以前未提交过类似文件 Similar documents not previously submitted
提出通过前体离子扫描 precursor-ion scanning
指代前面提到过的事物 it
提前过
Passed in advance
以上为机器翻译结果，长、整句建议使用 人工翻译 。
youdao
当提前学习过之后，以前的科目就显得很简单，你是否觉得很惊讶？
Do you ever get surprised how easy early subjects appear, once you advance in them.
他提前很早就制订出了自己的进度表，然后从未偏离过它。
He planned his schedule far in advance, and he didn't deviate from it.
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