for example与such as的区别

for example作“例如”讲时,一般只以同类事物或人中的“一个”为例,作插入语,用逗号隔开,可置于句首、句中或句末.
For example,air is invisible.例如,空气是看不见的.
He,for example,is a good student.例如,他就是个好学生.
such as也作为“例如”讲,用来列举同类人或事物中的几个例子.
Some of the European languages come from Latin,such as French,Italian and Spanish.
有些欧洲语言来源于拉丁语,例如,法语、意大利语和西班牙语.
Boys such as John and James are very friendly.像约翰和詹姆斯这样的男孩都很友好.