定位：头向后倾让喉咙到胃的通道变直。
Positioning: Tilting your head back straightens out the line to your stomach.
吸气时先后倾，吐的时候头和身体再前倾，让气流和口水推动瓜籽经由舌头勇往直前。
Lean back, and then throw your head and body forward when you spit, allowing both the air and the water to force your seed forward through the tunnel of your tongue.
这时，那人示意让我把窗户按下。他头朝前微倾，说，“哎，你是从西海岸来的吧？”
The man outside signaled me to lower the window, and leaned his head forward. "Hey, are you from the West Coast?""
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