The boat chugged slowly along.

船突突地缓慢前进。

The boat chugged down the river.

小船突突地沿江而下。

The boat chugged along.

汽船突突地前进。

The boat chugged along the canal.

小船稳稳地顺著运河突突地航行。

The boat chugged along the canal.

小船稳稳地顺着运河突突地航行。