To explain according to reason.

以理性说明。

To make, or show to be, reasonable.

使合理。

To cause to adopt reason as a guide.

使有理性；使具有合理性。

To remove radical signs from.

【数】去根号；有理化。

To assign a plausible explanation to (one's actions or attitudes, of which the real motive may be suppressed or unconscious).

【心理】(以任何理由使自己的行为)合理化；找藉口文饰。

To make (a method or system) more modern and sensible and less wasteful.

使(方法或组织)较合理化，现代化以减少浪费；使合乎经济原则。

To rely solely on reason for guidance.

专凭理性。