the delta, and the existence of a channel etched into the crater wall, suggest that a river once flowed into a standing body of water.
三角洲以及在陨坑壁有过河道存在的迹象都表明有一条河流曾经流入该陨坑。
in responding to the pandemic, who has also drawn on advice from a standing body of experts, the strategic advisory group of experts on immunization (sage), which advises who on vaccine use.