它是指你不应该乱扔垃圾。
无论我们在哪里，我们需要自律，我们不应该乱扔垃圾，插队或者在安静的场合打扰别人。
No matter where we are, we need to behavior ourselves, we should not litter, jump the line or disturb others in the silent place.
第一，我们不应该乱扔垃圾，无论何时我们手中有垃圾，应该养成扔进垃圾箱的习惯，有时候垃圾是可以循环利用的。
First, we should not throw away the rubbish, whenever we have rubbish at hand, we should keep the habit to throw it into the dustbin, sometimes the garbage can be recycled.
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