on sale是句子的什么成分

There are so many kinds of tape recorders on sale that I can't make up my mind which to buy.

请问,on sale.. 在句子当中作为成分?

There are so many kinds of tape recorders on sale that I can't make up my mind which to buy.

这里的 on sale 是介词短语作定语，修饰 tape recorders 。

黎反修 - 英语翻译（已退休）

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