Cronus
A Titan who ruled the universe until dethroned by his son Zeus.
克罗诺斯：希腊神话中的一个提坦，在被他的儿子宙斯废黜之前一直统治着宇宙

【根】chron＝time（时间）

chronic
Of long duration; continuing: chronic money problems.
Lasting for a long period of time or marked by frequent recurrence, as certain diseases: chronic colitis.
Subject to a habit or pattern of behavior for a long time: a chronic liar.
adj. 慢性的；长期的；习惯性的

例句：
The economy flourishes despite a fairly high rate of chronic unemployment.
尽管失业率居高不下,经济仍在蓬勃发展。
She's developed a chronic cough.
她的咳嗽已成了一种慢性病。

chronicle
An extended account in prose or verse of historical events, sometimes including legendary material, presented in chronological order and without authorial interpretation or comment.
A detailed narrative record or report.
n. 编年史，年代记；记录
vt. 记录；把…载入编年史

例句：
They chronicled all the remarkable happenings of the Second World War.
他们把第二次世界大战中所有的重大事件都载入编年史中。

chronograph
An instrument that registers or graphically records time intervals such as the duration of an event.
n. 记时计；记秒表

chronology
The science that deals with the determination of dates and the sequence of events.
The arrangement of events in time.
A chronological list or table.
n. 年表；年代学

chronological
Arranged in order of time of occurrence.
Relating to or in accordance with chronology.
adj. 按年代顺序排列的；依时间前后排列而记载的

chronometer
An exceptionally precise timepiece
n. [天] 精密记时表；高度精确的钟表；航海经线仪

synchronize syn=sym=same
To occur at the same time; be simultaneous.
To operate in unison.
To cause to occur or operate with exact coincidence in time or rate: We synchronized our watches. To cause to occur or operate at the same time as something else: They synchronized their trip with the annual tulip festival.
To arrange (historical events) in a synchronism so as to indicate parallel occurrence.
To cause (soundtrack and action) to match exactly in a film.
vt. 使……合拍；使……同步
vi. 同步；同时发生

例句:
Look at your watches. Have them synchronize.
看一下你们的表，咱们来对一下。
He synchronized the time bomb with his watch.
他用自己的手表时间校正了计时炸弹的时间。

synchronous
Occurring or existing at the same time. See Synonyms at contemporary.
Moving or operating at the same rate.
Having identical periods. Having identical period and phase.
adj. 同步的；同时的

isochronal iso=same
Equal in duration.
Characterized by or occurring at equal intervals of time.
adj. 等时的；等时线的