If you are careful, you give serious attention to what you are doing, in order to avoid harm, damage, or mistakes. If you are careful to do something. 谨慎的; 注意的
adjective [原级]仔细的,小心的;谨慎的,周密的
Be very careful with this stuff, it can be dangerous if it isn't handled properly. 对这东西要小心,处理得不好可能会发生危险。
careful
“ -ful” ⌜ 表示满量的 - indicating full of or characterized by ~ ⌟