当使用默认的 bash 终端设置在后台运行作业时，bash 通常会捕获 SIGCHLD 信号并在打印下一个终端输出行之后 打印消息。
When you run a job in the background with default bash terminal settings, bash normally catches SIGCHLD signals and prints a message after the next terminal output line is printed.
消费者可以在地铁站内、商场、超市内的维洛卡自助终端机打印随选优惠券。
On-demand discount coupons are available from Velo vending machines installed in subway stations, shopping malls and supermarkets.
今天我们可以看到大量应用usb接口的终端设备出现。如键盘、鼠标、调制解调器、打印机、扫描仪、数码相机、摄像头以及移动存储设备等等。
Now we see a large number of computer peripherals using USB around us, such as keyboard, mouse, modem, printer, scanner, digital camera, video CAM and removable storage device etc.
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