log

log¹
noun

a part of the trunk or a large branch of a tree that has fallen or been cut off
原木，圆材
(亦作 logbook)an official record of events during the voyage of a ship or aircraft
（航海或飞行）日志
a ship's log.
航海日志。
■a regular or systematic record of incidents or observations
观察记录
keep a detailed log of your activities.
对你的行动作细致的观察记录。
an apparatus for determining the speed of a ship, originally one consisting of a float attached to a knotted line that is wound on a reel, the distance run out in a certain time being used as an estimate of the vessel's speed
计程仪；测速仪

(logged, logging)
[with obj.]

enter (an incident or fact) in the log of a ship or aircraft or in another systematic record
记录（航海，飞行情况）
the incident has to be logged.
必须把事故记录下来。
the red book where we log our calls.
记录我们呼叫的红本子。
■(of a ship or aircraft) achieve (a certain distance or speed)
（船，飞机）达到（一定的距离，速度）
she had logged more than 12,000 miles since she had been launched.
自她下水以来航程已达12,000英里。
■(of an aircraft pilot) attain (a certain amount of flying time)
（飞行员）达到（一定的飞行时间）
cut down (an area of forest) in order to exploit the timber commercially
（商业性）砍伐（林区）

常用词组
(as) easy as falling off a log

语源

Middle English (in the sense 'bulky mass of wood'): of unknown origin; perhaps symbolic of the notion of heaviness. Sense 3 originally denoted a thin quadrant of wood loaded to float upright in the water, whence 'ship's journal' in which information from the log board was recorded

继承用法
log in (或 on)

go through the procedures to begin use of a computer system, which includes establishing the identity of the user
进入（系统），注册，登录

log off (或 out)

log²
noun

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