1.Material
Without lifesaving measures, the brain starts to die within four to six minutes.
/wɪˈθaʊt/ /ˈlaɪfˌseɪvɪŋ/ /ˈmɛʒərz/, /ðə/ /breɪn/ /stɑrts/ /tu/ /daɪ/ /wɪˈðɪn/ /fɔr/ /tu/ /sɪks/ /ˈmɪnəts/.
2. Facts
[eɪ]
结束发音时，颚部慢慢抬起，嘴唇慢慢合上，可以感觉到舌部肌肉紧张
[ʊ]
要点：双唇收圆，稍稍向外突出；短元音，发音时嘴形小而圆，嘴角肌肉放松
[ɑ:]
舌身后缩，舌尖远离下齿
[aʊ]
[a]音后舌尖离开下齿，舌身后缩，舌后部向软腭抬起，发音慢慢滑向[ʊ]
[aɪ]
[a]音要发足，过渡部分与[eɪ]类似
3.Comments
[eɪ]不好发
4. Hours
练习0.5h.
