drastically : extreme and sudden adv.彻底地
carry out : subject to : 使服从
remain=stay=keep=continue to be=still v.保持
detect=inspect=examine=notice=spot=become aware / conscious=note=conserve=perceive v.检查
fault=flaw=defect=trouble=bug=virus=be something wrong with=be something matter with n.缺陷，缺点
enough=sufficient=adequate=cover=meet somebodys need adj.足够的
main=largely=principal=chief=major=key=primary=prime=predominant=core adj.主要的:
documentation=written account=evidence=proof n.证明
shift=switch=transfer=move=jerk v.转换
consistent=lasting=stay the same=constant=unchanging adj.持续的
drought=no rain at all=dry=dusty adj.干旱的
period=cycle=era=age n.年代
random=arbitrary=at random adj.随机的
molten=hot=heat=boiling / boiling hot=scalding / scalding hot adj.熔化的
intense=strong=passionate=powerful=deep adj.强烈的
discover=explore=find / unearth=turn up v.开发，发现
pattern=trade / commodity=business n.贸易
relate to=associate with=link to / connect to=identify with 联系