例句與造句

1. A third Greek author, Biton ( fl . 2nd century BC ), whose reliability has been positively reevaluated by recent scholarship, So did de Camp . } } He probably designed his bow-machines on the occasion of the sieges of Cumae and Milet between 421 BC and 401 BC . The bows of these machines already featured a winched pull back system and could apparently throw two missiles at once.
2. A third Greek author, Biton ( fl . 2nd century BC ), whose reliability has been positively reevaluated by recent scholarship, described two advanced forms of the " gastraphetes ", which he credits to Pythagorean of that name who seems to have flourished in the late 5th century BC . He probably designed his bow-machines on the occasion of the sieges of Cumae and Milet between 421 BC and 401 BC . The bows of these machines already featured a winched pull back system and could apparently throw two missiles at once.
3. It's difficult to find pull back system in a sentence. 用pull back system造句挺難的