📣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