arduous

US /ˈɑːr.dʒu.əs/
UK /ˈɑːr.dʒu.əs/
"arduous" picture
1.

艱鉅的, 費力的, 辛苦的

involving or requiring strenuous effort; difficult and tiring

:
The climb up the mountain was long and arduous.
爬山的過程漫長而艱鉅
Learning a new language can be an arduous process.
學習一門新語言可能是一個艱鉅的過程。