1
- a part of the trunk or a large branch of a tree that has fallen or been cut off原木, 圆材。
2
- （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。
2.1
- a regular or systematic record of incidents or observations（定期或系统的）观察记录：
keep a detailed log of your activities.
对你的行动作细致的观察记录。
3
- 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船舶测速仪。
(logged, logging)with obj.
1
- enter (an incident or fact) in the log of a ship or aircraft or in another systematic record把（情况）载入航海（或飞行）日志：
the incident has to be logged
此事必须载入航海日志
the red book where we log our calls.
我们记录各次停靠港口情况的红本子。
1.1
- (of a ship or aircraft) achieve (a certain distance or speed)（船, 飞机）达到（一定的航程, 速度）：
she had logged more than 12,000 miles since she had been launched.
自船只下水以来航程已达12,000余英里。
1.2
- (of an aircraft pilot) attain (a certain amount of flying time)（飞行员）飞行（一定的时间）。
1.3
- make a systematic recording of (events, observations, or measurements)对（事件, 观察, 测量）作系统记录：
the virus can log keystrokes that you make when you log on to all sorts of services.
当你登录各种服务系统时, 该病毒会系统地记录下你的按键操作。
2
- cut down (an area of forest) in order to exploit the timber commercially采伐（林区）树木。
WORD TRENDS
The verb log has become part of the vocabulary of modern paranoia. As the Oxford English Corpus shows， the word is now primarily associated with technology， in particular that used for surveillance: the spyware secretly records your keystrokes， logging sensitive information such as online banking passwords. Hackers are not the only ones responsible for the logging of information. Increasingly， those in authority are accused of systematically recording people's details without reason or permission: the government is logging details of every man， woman and child in 'Big Brother' computers.
短语
(as) easy as falling off a log
- informal very easy〈非正式〉易如反掌。
词源
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.
短语动词
log in（或on）
- go through the procedures to begin use of a computer system, which includes establishing the identity of the user（为进入计算机系统而）登录。
log off（或 out）
- go through the procedures to conclude use of a computer system退出（系统）, 注销。