第六天
[保持egin{cases}
color{purple}{sustain}egin{cases}
①使持续 & ext{sustain economy/interest/relationship}\
②遭受，经受 & ext{sustain injuries/financial/losses}\
③维持cdots 生命 & ext{sustain the argument}\
④证明，证实 & ext{sustain the argument}\
⑤使强壮，保持信心，支撑，承受重量 & ext{sustain the weight}\
ightarrow egin{cases}
-tain &达到一定水平egin{cases}
ext{attain}
end{cases}\
sus- &和"悬"有关，延续一个状态
end{cases}
end{cases}\
color{purple}{maintain}egin{cases}
保持，维修，供养，坚信\
ext{maintain + sth.}\
ext{maintain a family}\
ext{maintain a machine}\
ext{maintain a view that}cdots
end{cases}\
color{purple}{retain}egin{cases}
保持原样\
* 信息，记忆，内存保留\
* + ext{ sb.}=挽留人才\
ext{retain information}\
ext{retain facts}\
ext{retain staff}
end{cases}\
\
形近egin{cases}
attainegin{cases}
实现，达到\
\
egin{cases}
attain&经过长时间努力\
\
accomplish&才气，技能，成功= ext{succeed}\
\
achieve&努力工作学习（大的成就）
end{cases}
end{cases}\
detain 拘禁，耽搁
end{cases}
end{cases}]