Viewed from a distance, the scaffolding on the Capitol's dome makes the building seem perpetually out of focus.
为什么这里用viewed,不用viewing?
Viewed from a distance, the scaffolding on the Capitol's dome makes the building seem perpetually out of focus.
你的句子只能用过去分词 viewed,不能用现在分词 viewing——因为句子主语 scaffolding 与 view 之间是被动关系。又如:
Viewed from a distance, the hill looked like a tortoise. 从远处看这座山像一只乌龟。
Viewed from a distance, the island of Nepenthe looked like a cloud. 从远处眺望,尼彭西岛就像一朵云。
假如改用 see 也是一样。如:
Seen from above the cars looked tiny. 从高处往下看,车辆显得很小。
Seen from this angle the woman in the picture is smiling. 从这个角度来看,画中的女子面带微笑。