3.Then：afterward（时间上的），thereafter（逻辑上的），furthermore, (层次上 的）
4.Lastly：ultimately，eventually，in conclusion，last but not least，
6.And：plus，as well as，along with，in addition
7.Or：otherwise，if not，or else
9.Because：as，due to，since，as to，in that，for the reason that，for，now that
10.But：however，moreover，nevertheless，nonetheless，on the contrary，even if while，despite the fact that
13.Actually：as a matter of fact，indeed，literally，truly
14.Important: essential, significant, vital, crucial, profound, play a pushing, requisite, critical, fundamental, primary, elementary, underlying, rudimentary, basically, necessary…
16.many: numerous, myriad, infinite,
quantities of a (large) number of / (large) numbers of + 可数名词复数
plenty of +可数名词复数/不可数名词 a good/great many + 可数名词复
a large/huge amount of / large amounts of + 不可数 many a + 可数名词单数
Small: minimum, diminutive, minute, petite, wee, undersized, teeny, tiny,
18.bad: adverse(不利的), negative
19.good: excellent, outstanding, extraordinary, remarkable
20.Big: massive, enormous, tremendous, giant, vast, large, huge, bulky,
21.boring：dull, tiresome, tedious(乏味的)
ep: He that can read and meditate will not find his evenings long or life tedious.
22.worried: anxious, apprehensive, fraught
23.sad: depressed(无望的，失落的) ；gloomy(情绪低落的)
ep: She felt very depressed about the future.
ep: They found him in gloomy, downbeat mood.
ep: Both sides appeared very frustrated at the lack of progress.
ep: The region is renowned for its outstanding natural beauty.
ep: The book stands out as one of the notable landmarks in the progress of modern science.)
27.abundant: ample, plentiful, generous
28.different: various, a variety of, diverse
29.common: universal, pervasive(普遍的,普通的)
30.doubted: skeptical, suspicious(怀疑的)
ep: Most organizations are, quite understandably, suspicious of new ideas.
31.interesting: amusing, entertaining, engaging
32.brave: courageous, bold, fearless
33.reasonable: sound, rational, sensible