very difficult; severely testing stamina or resolution
physically toughened
substantially made or constructed
violent and lawless
feeling physical discomfort or pain (`tough\\\' is occasionally used colloquially for `bad\\\')
resistant to cutting or chewing
unfortunate or hard to bear
making great mental demands; hard to comprehend or solve or believe
造句
用作形容詞(adj.)
Humans have the tougher time ascending in harmlessness as compared with dolphins and whales. 相比海豚和鯨魚，人類在提升入無害中有著更困難的時期。
But as climate change causes plants to peak earlier, caribou newborns that eat the plants face tougher odds for survival. 但是當氣候變化的原因植物高峰前，北美馴鹿新生兒吃植物面對更困難的機率為了生存。
近義反義詞
tough
tough turf
tough talk
tough rock
tough with
tough laws
tough iron
tough film
tough call
tough pear
tough meet