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optional
adj
option
n
opt
v
optionally
adv
optionally
adv
例子
The school offers optional extracurricular activities such as chess club and drama club after school.
The elective course in photography is optional for students majoring in business administration.
The final project is optional, but many students choose to complete it for extra credit.
The homework assignment is optional, but completing it will help reinforce the concepts learned in class.
The SAT consists of sections on reading, writing and language, and math, along with an optional essay.
