I never once thought of it, Huck!

哈克，我还没想到这一点呢！

"I once thought of calling myself Red-handed Jack," he said diffidently.

“我曾经想过称自己为红手杰克。”他胆怯地说。

Squash was once thought to offer all-round fitness.

壁球曾一度被认为可以提供全面的健康。

It was once thought that lead could be transmuted into gold.

有人曾经认为铅可以变成黄金。

It was once thought that the sun travelled around the earth.

人们曾经认为太阳绕着地球转。