nautical twilight

常見例句

雙語例句

• The observer begins the telescope startup process around nautical twilight, preparing the telescope then adjusting the pointing and focus.
  觀測者大概在民用晨昏蒙影時(shí)開始啟動望遠(yuǎn)鏡， 然后將望遠(yuǎn)鏡指向目標(biāo)并調(diào)好焦距。
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