parachute

actuality  /ˌæktʃuˈæləti/  Jane thinks that they will probably marry in actuality but that he can not love the vain, shallow woman.  /ˈwʊmən/

vain  men can be jsut as vain as women /ˈwɪmɪn/ 男人有时和女人一样虚荣

　　The instructor struggled vainly to open his parachute. 教官拼命想打开降落伞，但是没有成功。

parachute  -> chute -> log chute 原木溜槽 原木滑道

plural:

woman /ˈwʊmən/->  women /ˈwɪmɪn/ 参照 Apophony  https://en.wikipedia.org/wiki/Apophony

 sound change  的理论