sinceについて
The Hayabusa Project was very ambitious. JAXA set very difficult goals for the mission: developing ion engines, developing an autonomous navigation system, collecting soil samples from Itokawa, and bring them back. Since asteroids like Itokawa date from the beginning of our solar system, such samples will help solve the mysteries of our system's origin. This would be unprecedented in the history of space exploration.
Since asteroids like Itokawa date from the beginning of our solar system, such samples will help solve the mysteries of our system's origin. の英文のsinceはどういう用法で用いられてるかわかる方いませんか?
それとこの英文のようにSince文の最初の来て完了形で用いられていない場合があるのですがこの場合のsinceはどういう意味ですか?
お礼
siththanですね