使成为水平，使平坦，使平均。
平坦的底座使之在桌上十分稳定。
道路的平坦使他们剩下的路程舒服多了。
The flatness of the road make the rest of their trip more comfortable.
将步兵战车停置于平坦的地面上，使炮管处于水平状态；
Place infantry fighting vehicle on even ground to make gun barrel in a horizontal position;
将步兵战车停置于平坦的地面上，使炮管处于水平状态；
Place infantry fighting vehicle on even ground to make gun barrel in a horizontal position;
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