As the small boat moved, gently along the river he was left speechless by the mountains being silently reflected in the water.

小船缓缓地沿着江面行驶，群山的倒影静静地映在水中，他说不出话来。

youdao

The small boat is rocking on the river.

小船在江面上晃荡。

《新英汉大辞典》

There is a battle for survival and eventually it is just Pi and the tiger left in the small boat.

故事讲的是一场生存的战斗，最后只有派和老虎留在了那只小船上。

youdao

He lay in the front of the small boat.

VOA: special.2010.03.06

The boat was so small that no one believed it could stay afloat for very long.

VOA: special.2010.03.06

A flat-topped boat called the On-Time Ferry takes people and cars to a nearby small island,Chappaquiddick.

VOA: special.2011.07.25

The small boat appeared to be headed for that port, the Defense Department officials said, adding that their information was preliminary.

CNN: U.S. Navy ship fires at small boat in Persian Gulf

While the Navy has used drones before for mine clearing and other defensive tasks, the small boat (similar to that pictured above) is the first experiment to involve true offensive capabilities.

ENGADGET: US Navy tests first 11-meter missile-firing sea drone (video)

The officials, who would not be identified because of the sensitivity of the situation, also described the small boat as having made a series of maneuvers, but emphasized they were waiting for more details about what exactly happened.

CNN: U.S. Navy ship fires at small boat in Persian Gulf