美 
											[spɑːn'teɪniəs]
																
										
							done,happening,said,etc. because of a voluntary impulse from within,not caused or suggested by sb/sth outside
natural,not forced
																																	"spontaneous laughter"
																							"spontaneous combustion"
																							"a spontaneous abortion"
																															
																																	"he made a few ad-lib remarks"
																															
Stories and poems were springing into spontaneous creation in his brain.
出自: J. London
Edward clapped his hands briskly,..a spontaneous gesture.
出自: G. Gordon
The applause was spontaneous, even heartfelt.
出自: W. F. Buckley
When they met for the first time it was with spontaneous and mutual antipathy.
出自: D. Madden