play与on的用法有什么区别呢？

　　意思不同。

　　1.at play：在玩耍中；在起作用。可以做定语、表语、状语等。如：

　　For instance,at play,they often imitate adult roles and relationships in their own families.

　　例如，在玩耍中他们常常模仿他们自己家庭中成人的角色与关系。

　　It smashed on the ground below,narrowly missing some children at play.

　　这个花盆在地上砸得粉碎，差点就砸中了在旁边玩的小孩。

　　Pause now and then to smell a rose or watch children at play.

　　时不时停下来去闻一闻玫瑰或看看玩乐中的孩子。

　　Hence some other factor must be at play.

　　因此，一定是些其它因素在起作用。

　　Yet there is more than knowledge at play in the public speaking area.

　　然而，在公开演讲这一领域还有比知识更多的东西。

　　Seasonal factors are at play in the recovery.

　　季节性因素在反弹之中起了作用。

　　2.on play：在玩上（面）；在表演上。在句子里可以做状语、表语、定语等。

　　I let my daughter who is 6 months old on play for short periods in her room alone,but I could see her at all times.

　　以前，我总让我6个月大的女儿在她房间里独自玩上一会，但我还是会时刻看着她。

　　Some feel that the grass court season is too short but for anyone who struggled on play,it can't come soon enough.

　　有人觉得草坪赛季太短了，但对于真正为表演（这里指比赛）奋力拼搏的人来说，它不会很快开始。