what's the time ()your watch 为什么要用介词by by在这里的中文意思是什么?

what's the time ()your watch 为什么要用介词by by在这里的中文意思是什么? what's the time by your watch 为什么用by 请问What is the time by your watch?这里为什么要用by呢 What the time by you watch 这局话的中文意思?为什么用by? what's the time by your watch? What's the time on your watch?还是What's the time by your watc What's the time by your w____? what's the time by your watch?twelve thirty .but it's four m My watch may be several minutes ----.what's the time by your What time is it by your watch. What time is it by your watch可以说成What time do by your watch吗 What time is it by your watch可以说成What time do your by watch吗