准备一根小管子和一个气球。从气球上剪下一小块长方形的皮条,把皮条绷在小管子的一头,然后用胶布固定好,小口哨就做好了。注意,皮条不能绷得太紧,也不能绷得太严实,要留有缝隙。如果选用不同材料的小管子,小口哨还能吹出不同的声音。小口哨@流沙 Prepare a small tube and a balloon. Cut a small rectangular strip of leather from the balloon, stretch the strip to one end of the tube, and then secure it with tape to make the whistle ready. Note that the leather can not stretch too tight, it can not stretch too tight, to leave gaps. If you choose a small tube of different materials, small whistle can blow different sounds. Whistling @ quicksand