partly

Compared meaning: partly, not completely (adverb).

比较义项：部分地，非完全地（副词）。

• partly 本词

  Partly is conversational and often introduces one of several causes behind a result, frequently in the pattern 'partly...and partly...'; it favors reasons over describing the degree an action or state is completed.

  partly 较为口语化，常用来说明造成某个结果的原因之一，尤其常以“partly...and partly...”的结构出现；它更侧重说明原因，而不是描述动作或状态完成的程度。

  The team's win was partly due to luck and partly due to skill.

  这次胜利部分归功于运气，部分归功于实力。

• partially

  Partially is more formal and typically modifies a passive verb or adjective to state how far an action or state has progressed, as in fixed collocations like 'partially charged' or 'partially closed', rather than giving a reason.

  partially 语气更正式，通常修饰被动动词或形容词，说明动作或状态进行到的程度，常见于“partially charged”“partially closed”这类固定搭配，而不是用来说明原因。

  The battery was partially charged, so the phone died within an hour.

  这块电池只充了一部分电，所以手机用了不到一小时就没电了。

Partly and partially both mean 'not completely'. Partly is casual, often giving one reason among several for a result ('partly...and partly...'). Partially is more formal, usually with a passive verb or adjective, showing degree of completion, like 'partially closed', not a reason.

partly 和 partially 都表示“部分地，非完全地”，但语气和搭配不同：partly 更口语化，常用来说明造成某个结果的原因之一，尤其常见于“partly...and partly...”结构；partially 更正式，常与被动动词或形容词连用，强调动作或状态完成的程度（如“部分关闭”“部分充电”），而不太用来说明原因。两者在不少语境中可互换，但典型用法有别。