adj. 形容词可选择的，非强制的
Participation in the event is optional for all students.
所有学生参加这个活动是可选的。
The extra credit assignment is completely optional.
额外的作业是完全可选的。
Attendance at the meeting is optional but encouraged.
参加会议是可选的，但鼓励参加。
Wearing a uniform is optional for this event.
穿制服参加这个活动是可选的。
Reading the supplementary materials is optional.
阅读补充材料是可选的。
The workshop is optional for employees.
员工参加这个研讨会是可选的。
Participation in the survey is optional.
参与调查是可选的。
Bringing your own laptop is optional.
自带笔记本电脑是可选的。
Joining the club is optional for all members.
所有成员加入俱乐部是可选的。
Completing the bonus task is optional.
完成额外任务是可选的。
Taking the advanced course is optional.
参加高级课程是可选的。
Submitting the form is optional for volunteers.
志愿者提交表格是可选的。
Attending the seminar is optional but beneficial.
参加研讨会是可选的，但有益。
Buying insurance is optional for travelers.
旅行者购买保险是可选的。
Completing the survey is optional for participants.
参与者完成调查是可选的。
Joining the mailing list is optional.
加入邮件列表是可选的。
Bringing snacks to the party is optional.
带零食参加聚会是可选的。
Participating in the discussion is optional.
参与讨论是可选的。
Attending the training session is optional.
参加培训课程是可选的。
Completing the feedback form is optional.
填写反馈表是可选的。
The mountaineer reached the summit.
这名 登山者 到达了山顶。
Remember to hydrate during your workout.
记得在锻炼期间补水。
The house was built with timber.
这座房子是用木材建造的。
She asked him to come to the party tonight.
她请他今晚来参加派对。
We need to eliminate all risks.
我们需要消除所有风险。
Children often imitate their parents' behavior.
孩子们经常模仿父母的行为。
I always dread going to the dentist.
我总是害怕去看牙医。
Communication is key to maintaining a healthy relationship with others.
沟通是维持良好关系的关键。
She began to grieve after the news.
她在听到消息后开始悲伤。
Can you echo what I just said?
你能重复我刚才说的话吗？
We need to preserve our culture.
我们需要保护我们的文化。
We use unity to build games.
我们使用Unity来制作游戏。
The book will chronicle his adventures.
这本书将记录他的冒险。
I have never tried caviar.
我从未尝试过鱼子酱。
The boat sailed into the fjord.
船驶入峡湾。
I study русский language.
我学习俄语。
I'm eagerly waiting for the movie sequel.
我迫不及待地等待电影续集。
The arbitrator made a fair decision.
这位仲裁者做出了公平的决定。
The room was very dark.
房间里非常黑暗。
The country was a plutocracy.
这个国家是一个 富豪统治。
