outdoors

Compared meaning: the outdoors, an open-air space (noun).

比较义项：户外，露天的空间（名词）。

• open

  Almost only used in the fixed phrase 'in the open', meaning an exposed space with no shelter; sounds formal or literary compared with 'outdoors'.

  几乎只用于固定短语 in the open，指没有遮蔽、暴露在外的空间；比 outdoors 更书面、更带文学色彩。

  They spent the night in the open, with no tent for shelter.

  他们在露天过了一夜，没有帐篷遮蔽。

• outdoors 本词

  The everyday, neutral word for the world outside buildings; used freely in phrases like 'the great outdoors' without needing 'in the'.

  日常、中性的说法，指建筑物之外的世界；可以自由使用，比如 the great outdoors，不需要搭配 in the。

  She spends every weekend hiking and camping in the great outdoors.

  她每个周末都在户外徒步和露营。

Both words can mean an outdoor space. Open appears almost only in the phrase 'in the open', a literary term for an exposed, unsheltered space. Outdoors is the everyday, neutral word, used freely in many situations. Open's adjective and verb meanings are not compared.

两词都能指“户外、露天”，但 open 在这个意义上几乎只出现在固定短语 in the open 里，语气偏文学化，强调暴露、无遮蔽；outdoors 才是日常、中性的说法，可以自由用在各种场合。这里不比较 open 作形容词“开着的”或动词“打开”的意思。