It isn't actually known how many sites there are across Australia where rock art can be found—but unfortunately, we do know that much of the art is being lost to us.

目前还不知道在澳大利亚有多少地方能够发现这种岩石艺术；但不幸的是，我们知道有很多艺术作品正在消失。

youdao

At the start of the project we were raring to go but unfortunately we've lost a lot of our early enthusiasm.

这个项目开始的时候我们都满怀热情，但不幸的是我们现在已经没有当初那么热心了。

youdao

Unfortunately, this book has been lost because of removing, but please believe me that I always know it really tells about!

糟糕的是，搬家的时候这本书丢了，但请你相信我一直懂得它的含义。

youdao

Unfortunately for us and the world, this simple but profoundly important truth is lost on virtually all economists and central bankers today.

FORBES: Slick Solution

We have, unfortunately, lost three citizens today as a result of the blast in Ankara, but in the later hours there was another attack in Siirt, in a city in the eastern part of Turkey, where four young girls were killed as a result of an attack in a car, and these were civilian citizens.

WHITEHOUSE: President Obama's Bilateral Meeting with Prime Minister Erdogan of Turkey | The White House