There was, of course, no observation window.

当然，那儿根本没有什么观察窗。

youdao

Automatic control, bath solution observation window, bath cover.

自动控制、槽液观察窗、槽盖。

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There is an observation window on the hatches available for watching during operation.

检修口上设有观察窗，在搅拌过程中方便观察。

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However, when the same warder looked in his cell through an observation window just over an hour later, she saw him hanging.

BBC: Aylesbury Young Offender Billy Spiller 'like a tornado'

At Devens, he is locked inside a 10-by-10-foot cell with a steel door, a slot for food and an observation window, a prison spokesman said Sunday.

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"Fortunately, the largest patch of open water is in front of the observation window where visitors can see the swans and ducks at feeding time, " a spokesperson for the centre said.

BBC: Welney welcomes wildfowl that fled harsh Arctic weather