您要查找的是不是：
- The cabin has a flat stone for a threshold. 这间小屋用一条扁平的石头做门槛。
- The treaty will be the threshold of lasting peace. 这个条约将成为持久和平的开端。
- He was on the threshold of his career. 他的事业刚刚起步。
- He had never crossed the threshold of a bar before. 他过去从未进过酒吧的门。
- The optical system of the eye stimulate cell of the retina. 眼睛的视觉系统刺激视网膜内的细胞。
- Scientists are now on the threshold of an important discovery. 科学家们很快就会有一项重大发现。
- Sight is made possible by rays of light impinging on the retina. 由于光线射到视网膜上,眼睛才看得见。
- retinal threshold 视网膜阈
- The optical system of the eye stimulates cells of the retina. 眼睛的视觉系统刺激视网膜内的细胞。
- The tax threshold for a single pensioner is 450 dollars. 单身养老金领取者的征税起点是450美元。
- The court is not legally justified in stopping at the threshold of the case. 一开始就使案件停止不前，法院这样做是完全不合法的。
- They are at the threshold of a new career. 他们正要开始干一番新的事业。
- Rhegmatogenous retinal detachment in children. 儿童孔源性视网膜脱离。
- A detached retina is more serious. 视网膜剥离就更严重了。
- Rays light impinge upon the retina. 光线射到网膜上。
- Stage 2B: Operculated, traction to retina released. 有盖的，（玻璃体）对网膜的牵引解除。
- He was operated on for detachment of the retina. 他作了视网膜剥离手术。
- There must be a threshold of thermal noise. 必有一个热噪声的门限值。
- The large retinal vessels seem to be intact. 视网膜大血管看似正常。
- He is on the threshold of success. 他即将成功。
