A polite greeting to the elevator operator, a thanks to the mail delivery person and a kind word to the assistants will be appreciated.
对电梯操作员礼貌问候，对邮递员表示感谢，对助理说句友善的话，这些都会得到赞赏。
An operator control may be connected to the control unit for controlling the fluid delivery system and may be a handheld device.
操作者控制器可连接到控制单元以控制流体输送系统，且它可以是手持装置。
An operator control may be connected to the control unit for controlling the fluid delivery system and may be a handheld device.
操作者控制器可连接到控制单元以控制流体输送系统，且它可以是手持装置。
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