apologetic
adj
~ (about/for sth) feeling or expressing regret; making an apology 表示歉意的; 道歉的
an apologetic letter, voice 道歉信, 语气
He was deeply apologetic about his late arrival. 他对迟到深表歉意.
It soon became clear that the straight part of the dance changed when the sun's position changed. If the feeding place was toward the sun, the dancer headed straight upward during the straight part of the wagging dance.