noun🔗Share凹面，凹陷。 A concave surface or curve."The inside of the bowl is a concave shape. "这个碗的内侧是一个凹面。architecturemathscienceChat with AIVocabulary GamePractice Reading
noun🔗Share苍穹，天空. The vault of the sky."The vast concave of the night sky was dotted with stars. "浩瀚的夜空苍穹点缀着繁星。astronomyspaceChat with AIVocabulary GamePractice Reading
noun🔗Share天球，凹面. One of the celestial spheres of the Ptolemaic or geocentric model of the world."Aristotle makes [Fire] to move to the concave of the Moon. - Thomas Salusbury (1661)."亚里士多德认为，火会移动到月亮天球的凹面处。astronomyworldspacetheorymythologyChat with AIVocabulary GamePractice Reading
noun🔗Share凹面, 凹陷处 An element of a curved grid used to separate desirable material from tailings or chaff in mining and harvesting."The miner carefully adjusted the concave in the sifting machine to better separate the gold from the gravel. "矿工小心地调整了筛选机里的凹面挡板，以便更好地将金子和砂砾分开。agriculturemachineparttechnicalChat with AIVocabulary GamePractice Reading
noun🔗Share凹槽, 内凹面 An indentation running along the base of a surfboard, intended to increase lift."The concave on the bottom of the surfboard increases lift, making it easier to ride waves. "冲浪板底部的凹槽可以增加升力，让冲浪更容易。sporttechnicalnauticalChat with AIVocabulary GamePractice Reading
noun🔗Share凹面，凹槽 An indented area on the top of a skateboard, providing a position for foot placement and increasing board strength."The concave on the skateboard allowed the skater to maintain a firm grip. "滑板上的凹槽设计使滑板者能够保持稳固的抓板感。sporttechnicalstructurevehicledeviceChat with AIVocabulary GamePractice Reading
verb🔗Share使凹陷，弄凹。 To render concave, or increase the degree of concavity."The sculptor used a special tool to concave the inside of the bowl further, creating a deeper depression. "雕塑家用特殊的工具使碗的内侧更加凹陷，做出了一个更深的凹陷。appearancestructuretechnicalChat with AIVocabulary GamePractice Reading
adjective🔗Share凹的，内凹的 Curved like the inner surface of a sphere or bowl"The inside of the soup bowl was concave, making it perfect for scooping up the last bits of soup. "这个汤碗的内侧是凹进去的，所以舀起最后一点汤来非常方便。appearanceChat with AIVocabulary GamePractice Reading
adjective🔗Share凹的，内凹的。 (of a polygon) not convex; having at least one internal angle greater than 180 degrees."The shape of the garden plot was concave, with a large inward curve in one section. "花园那块地的形状是凹的，有一部分向内弯曲得很厉害。mathtechnicalstructurescienceChat with AIVocabulary GamePractice Reading
adjective🔗Share凹的，内凹的 (of a real-valued function on the reals) satisfying the property that all segments connecting two points on the function's graph lie below the function."The graph of the student's test scores showed a concave pattern; each segment connecting two test scores lay below the curve. "学生的考试成绩图呈现出凹形的趋势；连接任意两个成绩点的线段都位于曲线的下方。mathfunctiontechnicalChat with AIVocabulary GamePractice Reading
adjective🔗Share凹的，中空的 Hollow; empty"The old, concave dish was almost empty after the family dinner. "晚饭过后，那个旧的、凹下去的盘子几乎空了。appearancearchitectureanatomymathsciencetechnicalChat with AIVocabulary GamePractice Reading
