As the small boat approached the swans slowly from behind, the swans glided slowly away. As the boat picked up speed, so did the swans--maintaining a distance of about 60 meters between us and them.
小船緩緩跟在鵝群後面慢行，天鵝們慢遊；快行，天鵝們也快遊，始終與我們保持六十米左右的距離。