strenuous

词形变化：

副词: strenuously | 名词: strenuosity |

词义辨析：

同义:

a.强烈的; 充满活力的

active

energetic

vigorous

intense

a.艰苦的

difficult

hard

rough

rugged

arduous

laborious

同义参见:

painful

troublesome

tiresome

exhausting