1.log作“伐木,切木材”解时,可用作不及物动词,也可用作及物动词,用于及物动词时其后常接“树木,林木,木材”等之类的名词作宾语。
2.log作“把…记入航海日志”解时,用作及物动词。
3.log还可作“以…速度航行或飞行”解,用作及物动词,其后常接有关速度的名词作宾语。
4.log后可接in〔on〕表示“开始工作”;接off表示“结束工作”。
5.log的过去式和过去分词均为logged。

log in〔on〕(v.+adv.)
开始工作 (especially concerning a large calculating machine) to start work
▲log in〔on〕
In order to log in you have to type in a special password.为了进入,你必须打入特殊的通行密码。
State when you logged on, and remember to write down the time you log off.写明注册时间,并记住写下你注销的时间。

log off(v.+adv.)
结束工作 (especially concerning a large calculating machine) to finish work
▲log off
It took two hours to complete the calculation, so we logged off at 4 o'clock.我们花了两个小时才完成计算,因而是在四点结束工作的。

log up(v.+adv.)
▲log sth ⇔ up
1.把…记入航海或飞行日志 mark up in a log-book
They logged up the ship's position regularly.他们定时把船的方位记入航海日志。
The ship has now logged up voyages equal to a distance ten times round the world.该船迄今已有相当于环球10周的航程记录。
2.取得 achieve
We have logged up a remarkable series of gains in technical innovation.我们已在技术革新方面取得一系列可观的成就。
Our team has logged up an unusual number of wins this season.这个赛季里我们队获胜的次数异常多。

用作不及物动词
▲S+～(+A)
The college students spent their summer logging in the wood.大学生们暑假里在森林里伐木。
They log for a living.他们以伐木为生。
用作及物动词
▲S+～+n./pron.
They logged most of the trees in thearea.他们采伐了该地区的大部分树木。
They logged a large part of the trees.他们砍伐了一大片树木。
They logged the timber into 7-foot length.他们把那根木材切成七英尺长。
He logged the ship's speed at 10 knots.他在航海日志之中记下船速每小时十海里。
The plane logs 700 miles an hour.这架飞机以700英里的时速飞行。

［同义词］ n.  block, diary, journal, stamp
［词源］＜中古英语logge(圆木)

We transport logs by trains.我们用火车运送圆木。
The captain described the accident in the ship's log.船长在航海日志中描述了这场事故。