"too音标发音"...too音标发音
"good音标"...good音标
"book音标"...book音标
"zoo音标"...zoo音标
"tooth音标"...tooth音标
"cook音标"...cook音标
"took音标"...took音标
"look音标"...look音标
"foot音标"...foot音标
"food音标"...food音标
