adj.尖端细的；渐渐减少的
动词taper的现在分词形式.
Parrots, usually having long tapering tails, are often kept as pets. 鹦鹉通常长有锥形尾巴，常被作为宠物饲养。
The number of applicants for the course has been tapering off recently. 申请上该课程的人近来已逐渐减少。
