"worked their arduous way up the mining valley"
"a grueling campaign"
"hard labor"
"heavy work"
"heavy going"
"spent many laborious hours on the project"
"set a punishing pace"
The laborious breathing necessary in high regions.
出自: C. Darwin
A most laborious and long-winded letter.
出自: S. E. Ferrier
以上内容独家创作,受著作权保护,侵权必究
海词词典,十七年品牌