Sometimes lights are（）by fog，haze，dust，smoke，or precipitation which may be present at the light，or between the light and the observer，and which is possibly unknown by the observer.<br>A:obscured<br>B:darkened<br>C:greyed<br>D:delighted

Sometimes lights are（）by fog，haze，dust，smoke，or precipitation which may be present at the light，or between the light and the observer，and which is possibly unknown by the observer.
A:obscured
B:darkened
C:greyed
D:delighted

出自：海船船员证

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