estimate 估計，估量

estimate  估計，估量
propose  提議，建議，提出
modification  修改；改變

modification 有修改的意思(= change)
Ex: We've made some modifications to the design.
alternation 是兩樣物件或事情互相交替的意思。
Ex: There is an alternation of black and white stripes all over zebra's body.
Ex: Alternation of generations.(世代交替).

region  地區，地帶；行政區域
in the region of   大約(某數量、重量、價格等)
It will cost in the region of $ 500 .  
它大約得花費五百美元。

cry out  大聲喊叫

If you were to change your mind, please give us a call.
 = Were you to change your mind, please give us a call.

were someone/ something + to V
表示與事實相反 或幾乎不可能發生的事
 see
http://dictionary.cambridge.org/grammar/british-grammar/conditionals-other-expressions-unless-should-as-long-as

if you should need any assistance from me, please do not hesitate to contact me.
 = Should you need any assistance from me, please do not hesitate to contact me.
  (萬一)

dying  垂死的；行將結束的
deadly  致命的，致死的；毒性的
died  die  過去式  死