It would be a shame if you lost it.

你要是把它丢了就太可惜了。

《牛津词典》

youdao

You may be a little rusty, but past experience and teaching skills won't have been lost.

你可能会有点生疏，但过去的经验和教学技巧不会丢了的。

《柯林斯英汉双解大词典》

But you must be careful. It is easy to get lost in the waves of moving sand especially during sandstorms.

VOA: special.2010.01.04

Self knowledge is like lost innocence, however unsettling you find it; it can never be un-thought or un-known.

自我认知就像逝去的童真，不管你有多不安;,你已经无法不去想或是充耳不闻了。

耶鲁公开课 - 公正课程节选

I'm convinced that it's the reader's job to apply the same degree of critical scrutiny, a kind of Galilean critical scrutiny, to the image of Providence that will be elaborated, as you will see, at extraordinary length in Book Three of Paradise Lost.

我相信，把同等程度的细致的挑剔的观察,一种伽利略式的吹毛求疵的观察精神，运用到对将要被详细说明的天命的形象上去，是读者该做的事，你们往后会发现，卷三里洋洋洒洒写了很多。

耶鲁公开课 - 弥尔顿课程节选

So there would be things like that, where you thought that there was a pretty clear probability that many more lives would be lost, that you would not do.

NPR: The Morality of Negotiating with Kidnappers

And during six days in June and Yom Kippur one October, it seemed as though all you had built might be lost.

WHITEHOUSE: President Obama and President Peres of Israel Speak at State Dinner | The White House

Once you've lost that you may as well not be there anymore.

BBC: Vince Cable: Murdoch 'war' claim improved my reputation