Old batteries can't be discarded casually even when they are no longer useful, because they'll pollute the environment.
旧电池即使没用了也不能随意丢弃，因为它们会污染环境。
When you load an XML document, it is best to catch errors early, before they have a chance to pollute other data.
加载XML文档时，最好尽可能早地捕捉到错误以免传染其他数据。
Old batteries can't be discarded casually even when they are no longer useful, because they'll pollute the environment!
废旧电池即使没有了使用价值也不可随手乱丢，因为它们会污染环境！
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