There was, of course, no observation window.
当然，那儿根本没有什么观察窗。
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。
Automatic control, bath solution observation window, bath cover.
自动控制、槽液观察窗、槽盖。
Automatic control, bath solution observation window, bath cover.
自动控制、槽液观察窗、槽盖。
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