在这里必须有一种方式去向对象发出一个请求，在对象收到请求后才能照指令去完成一个事务，在屏幕上打印一些东西，或是打开一个开关。
There must be a way to make a request of that object so it will do something, such as complete a transaction, draw something on screen or turn on a switch.
万一发生识别错误，只要踩下脚踏开关，就可以使指令消除。
In case a wrong recognition is made, the command can be cancelled by simply pressing the foot switch.
调制解调器没有接受发送给它的指令。验证该调制解调器是否接线正确并且打开了电源开关。
The modem did not respond to the command sent to it. Verify that the modem is properly cabled and powered on.
在该加速期间结束时，以占空比与速度指令数据对应的PW M脉冲来控制开关机构，从而驱动该直流马达。
When the acceleration period has terminated, the switch means is controlled by a PWM pulse of the duty ratio in accordance with the speed instruction data, there by driving the DC motor.
固定在套管柱上的全井眼滑套能够按照指令完井设备上的每一个入口点进行开关。
The fullbore sliding sleeves cemented in the well casing string enable on-command opening and closing of each entry point in the completion hardware.
轿厢风扇、照明自动开关Car ventilation ，light automaticallyshutoff 在规定的时间内，没有召唤或指令信号，轿内的风扇和照明会自动关闭，以节省能源。
If there is no call registered within a predetermined period of time , the car fan and car light are automatically shut off to conserve energy.
轿厢风扇、照明自动开关Car ventilation ，light automaticallyshutoff 在规定的时间内，没有召唤或指令信号，轿内的风扇和照明会自动关闭，以节省能源。
If there is no call registered within a predetermined period of time , the car fan and car light are automatically shut off to conserve energy.
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