Get the current control, and clear all OPTION elements.
获得当前控件，并清除所有OPTION元素。
Birth control can clear acne for some women and can cause acne for others.
节育的妇女有的粉刺会痊愈，有的则会引发粉刺。
Bass section is clear, have good control and more impact which is nice.
低音清晰，有好的控制力和更多的冲击力而且是爽快的。
Clear yellow to enable the operator to see more clearly and control the machining condition.
清澈淡黄色，使操作人员能看清楚加工情况及更容易控制加工。
New digital control system, clear and simple to operate.
全新数字控制系统，操控清晰简单。
Thus, The range of regional snail control is clear and definite.
从而明确了区域性灭螺的范围。
Integrated control panel, simple and clear.
控制面板一体化，简单清晰。
Integrated control panel, simple and clear.
控制面板一体化，简单清晰。
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