“分心的”常见英文表达有 distracted、inattentive 或 absent-minded，具体使用哪个词取决于语境：
1、 distracted：
含义：因外界干扰（如手机、噪音等）而无法集中注意力。
例句：
He was distracted by the noise outside and couldn't focus on his work.（他被外面的噪音分心，无法专注于工作。）
Don't let your phone distract you while studying.（学习时别让手机分心。）
2、 inattentive：
含义：缺乏关注或警觉性，可能因习惯性疏忽或兴趣缺失导致。
例句：
The inattentive driver missed the stop sign and caused an accident.（分心的司机没注意到停车标志，导致了事故。）
She's often inattentive in class because she's tired.（她上课经常走神，因为太累了。）
3、 absent-minded：
含义：形容人“心不在焉”，因思绪飘远而忘记眼前的事。
例句：
My grandpa is always absent-minded—he forgets where he puts his keys.（我爷爷总是心不在焉，经常忘记钥匙放哪儿。）
He looked absent-minded during the meeting, probably thinking about his vacation.（会议上他看起来心不在焉，可能在想度假的事。）
总结：distracted：强调外界干扰（如手机、噪音）。
inattentive：侧重缺乏关注或疏忽。
absent-minded：形容因思绪飘远而显得“心不在焉”。
根据具体场景选择最贴切的词汇即可。