如果没有化学，我们永远不会知道我们需要肥皂来去除衣服上的油污。

Without chemistry, we would never have known that we need soap to get the oil out of clothes.

youdao

我们永远不会知道上帝为我们做的安排。

We don't always know what God's plans are for us.

youdao

我们永远不会知道，什么时候自己可能也需要一点帮助呢？

We never know when we might need a little help ourselves.

youdao

Now we will never know, and don't let anyone ever suggest to you that you will ever know, what Milton could possibly mean by this deliberately perplexing image of the two-handed engine at the door.

我们永远不会知道,弥尔顿在这句描写门边的双手引擎的,刻意的意象叠加里想要表达什么。

耶鲁公开课 - 弥尔顿课程节选