十级必修二 Oo and Pp
occur v. 发生
The accident occurred yesterday morning. 事故发生在昨天上午。
The time when a solar eclipse will occur can be calculated. 日食发生的时间可以推算出来。
officially adv. 官方地，正式地
The new clinic was officially opened this morning. 新诊所今天上午正式开业。
optimistic adj. 乐观的，抱乐观看法的
optim（最好）+istic（......的）→什么都往最好处想→乐观的
The stockholders are optimistic about the company's future. 股东对公司的前景很乐观。
同根词
orbit n. 轨道
The spacecraft is in orbit around the moon. 宇宙飞船在绕月球轨道运行。
circular orbit 圆周轨道；人造卫星 Manmade Satellite
organization n. 组织；机构
The refugees were resettled in Canada by a U.N. relief organization. 难民被联合国救难组织安顿在加拿大定居。
organize v. 组织，筹备；安排，处理
organ（器官；机关）+ize（动词后缀）→组织
Students need to learn how to organize their work. 学生们需学会如何安排好自己的学习。
词语辨析
outgoing adj. 爱交际的；友好的；外向的
He was outgoing and popular. 他为人爽直，很受人们欢迎。
同近义词
PhD abbr. （哲学）博士学位（Doctor of Philosophy 的缩写）
She decided to study for a PhD. 她决定攻读博士。
photograph n. 照片
photo(light)+graph(write)→照片
I planned to enlarge this photograph. 我计划放大这张照片。
family photograph 全家福(照片)
possibility n. 可能性
Is there any possibility that he will be elected monitor? 他有可能被选为班长吗？
preserve v. 保存，保护，保持
The issue is how to preserve it as a valued skill. 问题在于如何将其作为一种有价值的技能保存。
同根词
protection n. 保护
Her coat gave her protection from the rain. 她的外套使她免受雨淋之苦。
同根词
publish v. 出版；发表
publ(people)+ish（动词后缀）→出版
Her book was published last year. 她的书去年出版了。
punishment n. 惩罚
Punishment had very little effect on him. 惩罚对他没有什么效果。
同根词
puzzled adj. 困惑的，茫然的
John seemed puzzled about what the question meant. 约翰似乎不明白那问题是什么意思。
jigsaw puzzle n. 七巧板；智力拼图玩具