New words：

concern /kənˈsɜːn/

v. 动词

涉及；关于
使担忧；使挂念

n. 名词

担心；忧虑
关切；关心
事务；利害关系

详细词源拆解：

前缀 con-（加强） + 词根 cern（区分、留意），本义 “用心留意、牵涉其中”。
词义演变：牵涉、关联 → 使担忧；关注 → 担忧、关切；事务。

词汇家族

concern (v./n. 涉及；担忧)
→ concerned (adj. 担忧的；有关的)
→ concerning (prep. 关于)

必记高频搭配

be concerned about/for 担心；关心

We are all concerned about the bad weather outside.

concern sb 让某人担忧

Poor grades always concern my kind parents.

concern with 与…… 有关

This story concerns our school daily life.

as far as...be concerned 就…… 而言（写作高分句型）

As far as I am concerned, reading is great fun.

concern oneself with sth 忙于 / 关注某事

She concerns herself with helping new students.

关键使用提醒

concerning 为介词，等同于 about，书面语气更强

He told us a lot concerning his travel experience.

New words：

official /əˈfɪʃl/

adj. 形容词

官方的；政府的
正式的；公开的

n. 名词

官员；公职人员；行政人员

详细词源拆解：

词根 fic（做、执行） + 后缀 -ial；源自拉丁语 officium（职责、公务）。
词义演变：履行公务的 → 官方的、正式的；履职的人 → 官员、公职人员。

词汇家族

office (n. 办公室；职位)
→ official (adj. 官方的；n. 官员)
→ officially (adv. 正式地；官方地)

必记高频搭配

official news 官方消息

We wait for the latest official news from school.

official language 官方语言

English is an official language in many countries.

government official 政府官员

The government official visits our small village today.

official meeting 正式会议

All teachers attend this important official meeting.

officially (adv. 正式地)

Our new term officially begins next Monday morning.

New words：

seal /siːl/
n. 名词

海豹
印章；图章；封蜡，封条

v. 动词

密封；封口
盖章；盖印
封锁；封闭

详细词源拆解：

本词为异形同词，分两个独立词源：

表海豹：

源自古英语，本义专指这种水生动物，词义单一；

表印章、封缄：

源自拉丁语 sigillum（印记、图章），本义加盖印记、封口。

词义演变：

加盖印章 → 盖章、密封；封闭出入口 → 封锁、隔绝。

词汇家族

seal (n./v. 海豹；印章；密封)
→ sealed (adj. 密封的；加盖印章的)

必记高频搭配

official seal 官方印章

The paper needs an official seal to take effect.

seal (v. 盖章)

The manager will seal the document this afternoon.

seal a bag 密封袋子

Please seal the bag to keep the food fresh longer.

seal off 封锁；隔绝

Workers seal off the old road for safety reasons.

sealed (adj. 密封的)

The sealed jar can keep the fruit fresh for many days.

关键使用提醒

词义区分：结合场景判断含义，动物 / 印章 / 密封 三大义项不要混淆

New words：

engagement /ɪnˈɡeɪdʒmənt/

n. 订婚；婚约
n. 参与；投入
n. 约会；预约；事务安排

详细词源拆解：

词根：engage（v. 约定、投入、使忙碌）+ 名词后缀 -ment（表行为、状态、相关事物）。
词源本源：源自 en-（使）+ gage（承诺、契约），本义为 “定下约定”。
词义演变：订立承诺 → 婚约、约会；投入行动 → 参与、投身；事务缠身 → 工作安排、预约。

Sample Sentence

His engagement in sports keeps him strong and healthy.

I have an important engagement and cannot go out today.

Our teacher praises our full engagement in class activities.

They announced their engagement to all their close friends.

关键使用提醒

语体用法：正式词汇，书面写作、正式场景优先使用，口语多用 date/appointment

例句：His engagement in public activities is widely known.
翻译：他积极参与公共活动，这一点众人皆知。

New words：

engaged /ɪnˈɡeɪdʒd/

adj. 忙于…… 的；专心投入的
adj. 已订婚的
adj. （电话、座位、房间）被占用的

详细词源拆解：

源自动词 engage（en - 使 + gage 承诺、约束），动词表 “卷入、约定、忙于”；

加后缀 -ed 转化为形容词，语义沿用词根逻辑：

1. 被事务牵绊 → 忙碌的、投入的；
2. 立下婚约约定 → 已订婚的；
3. 被占用 →（场地、线路）使用中的

必记高频搭配

be engaged in 忙于；专心从事

SWhen I came in, he was engaged in writing a short article.

be engaged with 忙于应付；与… 交谈

The teacher is engaged with students after class today.

get engaged 订婚

The young couple got engaged last spring holiday.

fully engaged 全身心投入

All players are fully engaged in the fierce match now.

被占用 →（场地、线路）使用中的

The seat beside the window is already engaged by a girl.

关键使用提醒

1. 核心固定搭配 be engaged in (doing) sth，表 “忙于 / 专心做某事”

2. 表 “订婚” 常用搭配：be/get engaged to sb（与某人订婚，介词用 to）

   Her elder sister is engaged to a kind young man.
   她的姐姐和一位善良的青年订了婚。

3. 区分词义场景：描述人优先 “忙碌 / 订婚”；描述电话、场地多用 “被占用”

   I tried to call you, but your phone was always engaged.
   我试着给你打电话，可你的电话一直占线。

4. 语体说明：比普通单词 busy 更正式，书面写作、正式场景优先使用

   The scientists are engaged in important research every day.
   这些科学家每日都投身于重要的研究工作。