series:单复同形n.用法：a series of+n.连续的,一连串的
TV series 电视连续剧
in series 连续地
outdoors :adv.反义词indoors
用法：e.g.Playing outdoors is the most fun in my opinion.
It was warm enough to be outdoors all afternoon.
The ceremony was being held outdoors
spellbind:vt.三种形态：spellbind-spellbound-spellbound
用法：e.g.The children were spellbound by the circus performance.
on purpose=by design
e.g.He broke my bike on purpose.
in order to用法：表示目的状语的短语,=so as to=to do
注意so as to不能用于句首
如果要用从句,则相当于in order that=so that
dusk用法：at dusk
反义词：at dawn
thunder：n.&vi.
e.g.Thunder always comes after lightning
My little dog always hides under the bed when it thunders