你能告诉我怎样删掉手机里无用的信息吗？
Can you tell me how to cut out the useless messages in the mobile phone?
它在农村开设了50座小型发电站，主要是燃烧无用的米糠供能。
It runs 50 micro power plants in rural areas fired by burning otherwise useless rice husks.
一条语法规则，不管如何正确，除非能懂，否则毫无用处。
A grammar rule, however true (it is), is useless unless it can be understood.
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