characterized by toilsome effort to the point of exhaustion; especially physical effort
同义词：arduous??/??backbreaking??/??gruelling??/??hard??/??heavy??/??laborious??/??operose??/??punishing??/??toilsome
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。