另一方面，如果有人破坏环境，比如往地上吐痰或践踏草坪，我们可以阻止他们这样做。
On the other hand, if someone does harm to the environment, like spitting on the ground or stepping on the grass, we can stop them from doing so.
比如，在加拿大，我小时候看到过有人在公共场所随地吐痰，或是在家里把痰吐在痰盂里。
In Canada, for instance: when I was young I saw men spitting in public areas outdoors, or in spittoons at home.
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