This only applies to American space activities, but the hope is that it will help standardize a set of norms in the dawning commercial spaceflight industry throughout the world.
2019年6月六級真題（第二套）閱讀 Section C
柯林斯高階英漢雙解學習詞典釋義
N-VAR
黎明;拂曉
Dawn is the time of day when light first appears in the sky, just before the sun rises.