They made a raft and set it afloat.

他们做了一个筏子，使它漂浮在水上。

Alexander’s engineers built floating rafts for the heavy catapults.

大的工兵修建了浮动的筏子来运载沉重的弩炮。

The raft was -ried by ocean currents to a small island.

筏子洋流飘送到一座小岛上。