凹

• The rotor has recesses in its three faces between the lobes .
  转子在其凸角之间的三个面上有凹槽。
• The graph of a concave function is always below its tangent .
  一个凹函数的图象总在它的切线的下方。
• The small pits that form on the surface act as stress raisers .
  在表面形成的小凹坑起到应力增高源的作用。
• The rocks were folded by collapsing into the center of the trough .
  岩石由于坍陷进入凹槽的中心而发生褶皱。
• There is hollow in the thickened wall of a uterus into which the placenta grows .
  在变厚的子宫壁上有一凹处，胎盘就长在里面。
• Atoms of a row are comfortable in each trough between the atoms of the neighbouring row .
  一排原子安处在邻排原子之间的凹沟里。
• The clustered houses of the village peeped out from the woody hollow below .
  村庄里团团簇簇的房屋，从林木葱笼的凹地中探出头来。
• The fovea has only cones, and the blind spot or papilla has no receptors .
  中央凹的部分只有锥细胞，而盲点或神经乳头部分无视细胞。
• The only little change that the face ever showed resided in the two compressions or dints .
  这面孔上所仅有的小变动全在这两个凹处或瘪处。
• The dashed lines on the rotors show the locations of the recesses and how deep they are .
  转子上面的虚线就示出了凹槽的局部位置及其深度情况。