spontaneous

1. ADJ Spontaneous acts are not planned or arranged, but are done because someone suddenly wants to do them. 自然的; 自发的 (行为)

Diana's house was crowded with happy people whose spontaneous outbursts of song were accompanied by lively music. 戴安娜的房子挤满了幸福的人们，他们在欢快音乐的伴奏下不由自主地唱起歌来。

2. spontaneouslyADV 自然地; 自发地

Many people spontaneously stood up and cheered. 许多人自发地站起来欢呼。

3. ADJ A spontaneous event happens because of processes within something rather than being caused by things outside it. 自然的 (事件)

I had another spontaneous miscarriage at around the 16th to 18th week. 在大约第16至18周时我又一次自然流产了。

4. spontaneouslyADV 自然地[ADV after v]

Usually a woman's breasts produce milk spontaneously after the birth. 通常女性在生孩子后乳房会自然泌乳。