缺陷性非干扰病毒的英文：
DNI, defective non-interfering virus

The defect in the drainage must be remedied.
这排水系统的缺陷该设法补救。

The individual was somewhat of a small defect.
个别的难免有点小瑕疵。

Congenital defects,blindness,etc
先天性缺陷、失明等.

The alkanes are non-polar.
烷是非极性的。

non-bumper seesaw
防撞跷跷板

non-Euclidean norm
非欧几里得范数