part可数吗?如果可数,Here is part of his talk.此句如何解释.可数为什么不加s？Why？我问的是Why！

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• 初二英语---短文填词Now many middle school sutdents have a moblie phone.Because a lot of parents think( )their children have mobile phones ,it is( )for them to keep in touch with(联系)their children at any time.If a child is in ( )orlost.they can help him or her in time.But some teachers don't ( ) it is a good idea for students to carry mobile phones to schools.They say students depend(依赖)too much on them.For example,if they forget something,they may phone home