careful，carefully都是小心的意思，前者是形容词,作定语或表语。后者是副词,作状语,修饰动词或整个句子。
音标：英 [ˈkeəfl] 美 [ˈkerfl]
释义：仔细的，小心的;周到的;慎;心细
1、You must be careful when handling chemicals.
接触化学药品必须小心谨慎。
2、Be careful of the traffic.
注意交通安全。
3、Please be careful with my glasses (= Don't break them) .
请当心别打碎我的眼镜。
4、Be careful you don't bump your head.
留神别撞了头。
音标：英 ['keəfəlɪ] 美 [ˈkɛrfəlɪ]
释义：仔细地;小心谨慎地;警惕地;周密地
1、He is a slippery customer, and should be carefully watched.
他是一个狡猾的顾客，要小心提防。
2、Liz drew the word out carefully.
莉兹小心翼翼地说出了那个词。
3、All through lunch he had carefully avoided the subject of the house.
整个午饭期间，他一直在小心翼翼地回避房子的话题。
4、They are carefully graded.
它们被仔细地分成各种级别。