38'

over the period 经过很长时间
saliva 唾液
be converted into 转化成
defy 是不可能

35'

with very little effort 不费力气
no more than 仅仅
tussle 扭打

31'

be an assistance to 有帮助
a two-edged weapon 一把双刃刀
potency 效力

30'

as different as....is from...像……不同于……一样
act on 对……起作用

41'

by far ……得多
so to speak 可以这样说，打个比方

32'

be that as it may 尽管如此
do its business with man 在人的身上发挥作用，要人的命
viperine 毒蛇的