automatic用作名词时可指“能自己运转的机器、器械和工具”,在英式英语中可指自动的汽车挡。

The record player is set on automatic and will play several records before shutting off. 电唱机被拨到自动控制挡,放几张唱片后会自动关掉。

［派生词］ automatically adv. 自动地; 无意识地; 自发地‖automaticity n.自动,自发‖automotive adj. 汽车的,机动车辆的
［同义词］ adj.   electric, mechanical, push-button, self-acting, self-moving, self-operating, automated,habitual, instinctive, involuntary, occurring independently, reflex, unconscious,uncontrolled, unwilled, mechanical, routine
［反义词］ adj.   manual;conscious, controlled, deliberate intentional, voluntary

1.automatic的基本意思是“自动的”,指机器(装置)等在不用人工的情况下,自动完成人所做的工作; 也可指人基于习惯或出于本能,或者因袭陈规而作出的“无意识的,不加思索的,习惯性的,机械的,不自觉的”动作; 还可指事件“必然随之而来的; 必然发生的”。
2.automatic不用于比较等级。

用作定语
▲～+n.
This heating system has an automatic temperature control.这个暖气系统有自动温控装置。
We can get chocolate from an automatic machine.我们可以从自动售货机上取巧克力。
You can draw money from the automatic teller machine at the gate of the bank.你可以在银行门口的自动柜员机里取款。
Breathing is an automatic function of the body.呼吸是身体的一种无意识的功能。
A boy who has good manners stands up in an automatic movement when a lady enters the room.一个有礼貌的孩子,在一位女士进入房间时,便会不加思索地站起来。
You will get an automatic increase in pay every year.你每年一定有一次加薪。
These offences carry automatic fines.这些违法行为理所当然要罚款。
Taxpayers who do not send in their forms face an automatic fine.没有递交表格的纳税人必然面临罚款。
用作表语
▲S+be+～
This missile is fully automatic.这种导弹完全是自动操作的。
The doors to the department store are automatic. 百货商店的门是自动的。
The movements of machines are completely automatic, you only need to start and stop the machines.机器的运行是完全自动的,你只需开关机器就行了。
My reaction was automatic.我的反应是不由自主的。
Her response was completely automatic.她的反应完全是下意识的。
Her remark was automatic.她说的话有口无心。
For most of us breathing is automatic.我们大多数人的呼吸是无意识的。
Breathing and swallowing are usually automatic.呼吸和吞咽通常是出自本能的。
She knew the lesson so well that her answers were automatic.她功课很熟,答起问题来不假思索。
He is so familiar with the subject that his answer is quite automatic.他对这一课题非常熟悉,所以回答起问题来几乎不假思索。
The movements needed to ride a bicycle soon become automatic.骑自行车的动作很快就变成机械式的行动。
A fine for this offence is automatic.对于这种过失,罚款是必然的。

automatic, voluntary
这两个词的共同意思是“自动的”。前者多指机械方面“自动的”; 而后者多指表示人类的“有意志的自动”。