plates 前面是该用in还是on elder brothers and elder sisters , help m

具体情况具体分析,都可以.
再问： 是三明治在盘子里 该用什么呀
再答： The food in the plate has gone bad 。 There are several fruits in the plate 。 It is always polite to eat the food . If you do not eat it, just leave them in the plate 。 I could see some money on the plate 。 There is cream cake on the plate .盘子里有一块奶油蛋糕。 Please put the bones/ waste on the plate. 请把骨头和渣滓放到盘子里。 所以，plate 作盘子解，说食物水果在盘子里盘子上，应该是可以互换的。