它起源于泄殖腔壁侧面直接在前面的肚皮上发泄，和卷发向后使轴与头部直接位于下方的通风口开幕。
It originates from the wall of the cloaca directly in front of the vent on the belly side, and curls backwards so the shaft and head lies directly beneath the vent opening.
侧面通风口而定制，这些需要和街道的速度烟囱罩。
The side vent cowls are tailored to the needs and speeds of the street.
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