Pre-Test Click a numbered button to see an expression starting with number 1.
点击数字键观看表情，从数字键1开始。
The switch button for starting the control system is arranged on the spraying gun.
喷枪上设用于控制系统启动的开关按钮。
Click a numbered button to see an expression starting with number 1.
预测点击数字键观看表情，从数字键1开始。
Click a numbered button to see an expression starting with number 1.
预测点击数字键观看表情，从数字键1开始。
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