Как по Английски будет 离题的

adjective

Characterized by digression; tending to depart from the subject.

Примеры использования:

A digressive account

adjective

Tending to deviate from a course or activity; digressive.

noun

A straight line or plane that touches a curve or curved surface at a point, but if extended does not cross it at that point.

Примеры использования:

He noticed that he could draw three straight lines, or tangents, that each touched all three circles.

adjective

(of a line or plane) touching, but not intersecting, a curve or curved surface.

Примеры использования:

This curve is tangent to the average cost curve

adjective

Relating to or along a tangent.

Примеры использования:

A tangential line