When Ted was six we decided that he needed to know how to fasten and unfasten his seat belt.
泰德六岁时,我们决定让他知道怎样系和解他的安全带。
No. After taking off, you can unfasten it.
不。起飞后,您可以解开它。
Do not unfasten the seatbelt before the plane stops completely.
在飞机纯粹停止前,不要松开安全带。
Do not unfasten the seatbelt before the plane stops completely.
在飞机完全停止前,不要松开安全带。
Unfasten the R. A. clamp and turn the telescope around the polar axis to set the observing date on the date graduation ring to the observing time on the R. A. and hour graduation ring.
松开赤经制动钮并使望远镜围绕极轴旋转用以设置日期刻度盘上的观测日期对准赤经兼小时刻度盘上的观测时点。
Unfasten the R. A. clamp and turn the telescope around the polar axis to set the observing date on the date graduation ring to the observing time on the R. A. and hour graduation ring.
松开赤经制动钮并使望远镜围绕极轴旋转用以设置日期刻度盘上的观测日期对准赤经兼小时刻度盘上的观测时点。
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