例句與造句

1. To that end, Melroy and commander Brian Duffy had to perform a routine checkout of Discovery's rockets and control systems Saturday.
2. Endeavour's crew was to have a fairly sedate Sunday as it planned to do a routine checkout of the shuttle's rockets and control systems in preparation for its return to Earth.
3. It's difficult to find routine checkout in a sentence. 用routine checkout造句挺難的