📣Unit4
✨1. merge，merse 合并；吞没
merge
merger
emerge
emerging
emergence
emergency
immerse
immersive
✨2. ject 投掷；投射
eject
inject
injection
project
reject
rejection
subject
be subject to sth
subjective
subjectivity
object
object to sth
objective
objectivity
objection
✨3. lease，lax = loose 松开
loose
loose end
loosen
loosen up sth
lease
rent
rental
relax
relaxation
release
release sb from
✨4. fac，fec，fic 做
fact
in fact/as a matter of fact
factual
factor
feasible
feasibility
facilitate
facility
affect
affectionate
affection
effect
take effect
in effect
effective
effectiveness
efficient
efficiency
defect
deficient
deficiency
deficit
perfect
perfection
proficient
proficiency
profit
profitable
profitability
infect
infection
sacrifice
sacred
secret
saint
✨5. lev 抬高；变轻
level
lever
leverage
levy
alleviate
alleviation
elevate
elevator
relieve
relief
✨6. 落单词
bid
master
must
doubt
undoubted
undoubtedly
argument
argue
