1. in the open在户外，在露天，在开阔地带；公开地
Children need to play out in the open.
孩子需要在户外玩耍。
Many are sleeping in the open because they have no shelter.
很多人因为没有栖身之所，只好露宿在外。
We sleep out under the stars, and eat our meals in the open air.
我们在星空下露宿，在野外用餐。
He likes to cook in the open air.
他喜欢在外面做饭。
They have been forced to sleep in the open without food or warm clothing
他们被迫风餐露宿，吃不饱也穿不暖。
She said stations should be in the open, near housing, not overshadowed by trees or walls.
她说车站应该建在住宅区附近的开阔地带，而不应为树木或墙壁所遮挡。
Government officials do not want these comments in the open.
政府官员不想公开这些评论。
The medical service had advised us to keep it a secret, but we wanted it in the open.
这家医疗机构建议我们保密，而我们却想公开此事。
Theres confusion and resentment, and its almost never expressed out in the open. Take this office, for example
有人迷惘，有人憎恨，可是几乎谁也没有公开表达过。就拿这个办公室的人来说吧。
Her secret is now in the open. .她的秘密现已公开。
The Red Amy soldiers spent the night in the open.
红军战士在露天过夜。
2. in open仅仅有含义：公开地，公然地
She was tried in open court.
她被公开审判。
Hearing the case in open court is only one part of the judicial process.
公开审理这一案件只是司法程序的一部分。
Soon the entire armed forces were in open revolt.
很快，整个武装部队开始公然抗命。