used for telling someone to give attention to what they are doing because there is a risk they could have an accident, make a mistake, or damage something
noun [抽象名词]小心;当心
You have to be careful what you say on telly. 在电视上说话时你必须很谨慎。
be careful
“ -ful” ⌜ 表示满量的 - indicating full of or characterized by ~ ⌟