Flat tube in any cross section are oblong, the length of the shaft according to the tube pitch to determine the size of.
扁管在任何一个截面均为长圆形，其长短轴根据管心距的大小来确定。
Flat roofs may either be dead level or (preferably) have some degree of pitch to them so that rainwater and melted snow can drain away.
平屋顶可以为完全水平，也可以(这样更好)具有一定程度的坡度，以便雨水或融雪得以排除。
Please ask the singer to pitch the song up a little, they sound rather flat.
请歌手把调子唱高一点，他们唱的调子太低了点。
Why don't you pitch your tent here, this place is flat and nice.
你为何不在这儿扎营呢？这块地既又好。
Why don't you pitch your tent here, this place is flat and nice.
你为何不在这儿扎营呢？这块地既又好。
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