bejamin1111 发表于 2013-5-5 22:10
他不是已经说中间的often in the form of mutual funds是插入语么,去掉的话句子就是
Asset allocators cre ...
bejamin1111 发表于 2013-5-6 18:10
插入语归根结底都是modifier, modifier分essential modifier and non-essential,后者一般前后用逗号隔开, ...
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