1·He has a concave stomach.
他的胃是凹的。
—— 《柯林斯英汉双解大词典》
2·The palm of one's hand is slightly concave.
人的手掌是微凹的。
—— 《新英汉大辞典》
3·Since this is a concave function, it's not just the expected value.
由于这是一个凹函数，它不仅仅是期望值。
4·By extracting water from the detector's chamber, the detector's surface becomes a concave hemisphere.
通过从探测器的舱室中提取水分，探测器表面形成一个凹半球。
5·When water is pumped out of a chamber below the plate creating negative pressure, the stretchable sensors are pulled down, producing a concave shape.
当水从板下的一个腔中被抽出来产生负压时，可伸缩的传感器被向下拉，形成一个凹形。