It's important to leave no trace (痕迹) in public spaces.

重要的是不留痕迹在公共场所。

But I leave no trace and have no friends.

但我不会留下任何痕迹，而且我也没有朋友。

A true Leave No Trace fire shows no evidence of having been constructed.

一次真正的不留痕迹的营火是不会留下任何被改变过的迹象。

We should always strive to leave no trace on the rock face or the mountainside.

我们应当始终力求不在岩壁与山腰上留下任何痕迹。

Do group members possess the skill to build a campfire that will Leave No Trace?

队员是否能正确的按照不留痕迹的原则生造营火.