Long-ago builders could have attached wooden poles to the stones and rolled them across the sand.

很久以前，建筑工人可以在石头上绑上木杆，然后让它们在沙子上滚动。

Long-ago builders could have attached wooden poles to the stones and rolled then across the sand, the scientists say.

科学家们说，很久以前的建筑工人也许是在石头上绑上木杆，然后在沙子上滚动。

The house was pulled down long ago.

那栋房子很久以前就被拆掉了。

Rationing had put an end to a surfeit of biscuits long ago.

定量供应很久以前就结束了饼干过剩的情况。

He had decided long ago that he would put his trust in socialism when the time came.

他很久以前就已决定，他到时候将信仰社会主义。