... be necessary for…对于……来说是必不可少的 throw litter about 乱扔垃圾 keep you active 使你保持精力旺盛 ...
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We shouldn't spit in public places or throw litter about.
我们不应该在公众场合随地吐痰，乱丢垃圾。
youdao
You must not throw litter about.
别到处乱扔垃圾。
Don't throw litter about.
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