A transparent,biconvex body of the eye between the iris and the vitreous humor that focuses light rays entering through the pupil to form an image on the retina. 晶狀體，水晶體眼球中一種透明的雙面凸體，位于虹膜與玻璃體之間，它可使穿過(guò)瞳孔進(jìn)入眼球的光線(xiàn)聚集在視網(wǎng)膜上來(lái)形成圖像。
The NEM interpolant is strictly linear between adjacent nodes on the boundary of the convex hull, which facilitates imposition of essential boundary conditions. 根據基本邊界條件，自然鄰接插值在凸體邊界相鄰節點(diǎn)之間是嚴格線(xiàn)性的，于是可以用自然單元法來(lái)模擬非凸體表面裂紋。
