歌: sing; chant...
揣测: to guess, to conjecture...
赶赴: to hurry, to rush...
湖泊: lake...
船只: ship, boat, vessel...
网友: online friend, Internet user...
喜悦: happy, joyous...
红薯: sweet potato...
草原: grassland, prairie...
一旦: in case (sth happens), if, once (sth happens, then...), when, in a short time, in one day...