or
conj.
或,或者; 还是
A boy or two girls are at home.
一个男孩或两个女孩在家.
否则,要不然
Turn the heat down or your cake will burn.
把热度调低吧,要不蛋糕就要糊了.
也不
He cannot read or write.
他不会看书,也不会写字.
either
['aiðə]
pron.
(两者之中)任何一个
Either of the plans is equally dangerous.
这两个计划中,哪一个都同样有危险.
adj.
(两者中)任一的
You may use either computer.
两台计算机你可以随便用一台.
adv.
(否定句中)也
He won't go and I won't go either.
他不去,我也不去.
adj.
非此即彼的,两者择一的.
区别太明显了,你体会体会上面的例子.