What he did was, he got a transparent pipe — have you seen this demonstration before? — he attached it to a tap. So effectively what you had was, you had a situation where — I'll try and draw the tap and the pipe, actually I'll skip the tap. The taps are hard.
他是这么做的，首先准备一条透明的管子——你们以前见看过类似的没有？—— 管子连着水龙头。随后你就会看到， 你们马上就会看到——我会尽量把水龙头画出来 当然包括管子，事实上我会略过水龙头。很难画出来。