jsp购物车数量加减:求正确翻译

clock bingo
Ask the pupils to use a pencil to draw the hands on the first four clocks.They should use times which are precisely on the hour and half past the four only.then say a time,it is half past three,and all the pupils who drew this time on one of their clocks should cover it with an eraser or a piece of paper.the winner is the pupil who manages to cover all the clock faces first.the winnermust then say all the times he/she has covered to the rest of the class.the winner then takes the teacher place and calls out new times.the rest of the class and the teacher have to cover their clock faces.the second group of clock faces can be used immediately or left blank to be used for revising the time in later lessons.if the pupils enjoyed the game,the maybe it is better not to fill then in straight away,but to use them.to liven up more difficult lessons in the future.
更正:1winner must 2 teacher`s place