1.
With the flat side down or in contact with a surface.
平平地，扁平地以扁平面向下或与另一平面接触
2.
Plate-shaped particles will generally beoriented with the flat side down.
片状颗粒一般为平面向下。
3.
Flattened downward, as if pressed from above.
扁平的向下变平的，如同从上面压下一般
4.
The downward inclination of a rock stratum or vein in reference to the plane of the horizon.
下沉矿层或岩石相对水平面的向下倾斜
5.
(biology) flattened downward as if pressed from above or flattened along the dorsal and ventral surfaces.
（生物学）向下变平的好像从上面加压或沿着背部和腹部表面变平的。
6.
The upward or downward inclination of an aircraft wing from true horizontal.
上反角，下反角飞行器的机翼与水平面向上或向下的倾斜角
7.
A User-oriented Fair Scheduling Algorithm for Cluster System;
集群系统下面向用户的作业公平调度算法
8.
Shortcut of Determining the Direction of the Largest Main Stress under the Status of Plane Stress;
平面应力状态下判定最大主应力方向的捷径
9.
Out of plane stability of greenhouse side columns with eccentrically lateral braces
温室边柱侧向偏心支撑下的平面外稳定
10.
In other words, there is a horizontal flow from evenj point of the ocean towards the points directly under or directly opposite the moon.
换句话说，海水从海洋各处水平流向月球下面的点或背向月球的点。
11.
fall [lie] prone
面向下跌倒 [俯卧]
12.
Four orientations:face the government,the Pacific,the society,and the enterprises.
四个面向：面向政府、面向太平洋、面向社会、面向企业。
13.
In or to a place beneath; below.
在下面，在底下；向下在或向着地下的地点；在下面
14.
an inclined surface or roadway that moves traffic from one level to another.
从一个平面向另一个平面移动的斜面或路面。
15.
To take away this discouragement, I resolved to dig into the surface of the earth, and so make a declivity.
为了扫除这个障碍，我决定把地面掘平，掘成一个向下斜的土坡。
16.
A Simple Rule of Visual Determining Main Direction s General Position Under Horizontal Stress State;
直观确定平面应力状态下主方向大体位置的简单规则
17.
Long-term research on horizontal cracks at El.105 of downstream surface of Chencun arch dam
陈村拱坝下游面105m高程附近水平向裂缝长期分析研究
18.
Extended 2-D Numerical Modal Considering Transverse Transport of Sediment and Bank Deformation in Bend Flow Based on Moving Coordinate
移动坐标下考虑弯道横向输沙及河岸变形的平面二维数学模型