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经典短语透视
【短语1】be concerned about
【点拨】be concerned about意为"对……担心；对……关心"， 与be concerned for意思相同。如：
Many scientists are concerned about the impact of global warming on the world.
As a nurse， she is deeply concerned about the health of her patients.
【拓展】与concern相关的其他用法：
be concerned with"与……有关；涉及"；as far as ... be concerned"就……而言"；concerning介词，"关于……"。如：
Today’s lesson is concerned with English Literature.
As far as I’m concerned， science and arts education shouldn’t be separated.
I haven’t learnt anything concerning this matter before.
【短语2】feed on
【点拨】feed on意为"以……为食物"。如：
Owls feed on mice and other small animals.
【拓展】1. feed on与live on为同义词，但feed on常侧重指"(动物)以……为食"；而live on既可以指"(动物)以……为食"，又可以指"(人)以……为食"。如：
Southerners usually live on rice while people in the north live on wheat.
2. feed sth. to ... = feed ... on sth. 意为"用……喂……"。如：
My little son often feeds bread to the ducks.
She fed her guests on the produce of her garden.
【短语3】stand for
【点拨】stand for意为"代表， 象征某种含义"，不用于被动语态。如：
Do you know what the initials GDP stand for？
【拓展】
1. stand for还有"主张，支持；容忍，忍受"之意，作"容忍，忍受"讲时，常用于否定句或疑问句中。如：
Which team do you stand for？
Teachers usually won’t stand for any cheating of their students.
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