出现
occurrence
appearance
Presence
pop
Frequency
Presented
Present
emersion
appear
emerge
emergence
Occurs
appearing
arrival
Origination
peer
turn up
Development
to arise
to emerge
to appear
start
Figure
advent
Outcrop
Arise
occurence
come forth
apparition
originate
Appeal
1949-1978
come
come on the scene
come out
present itself
chop out
Appears
appeared
出现率
Frequency
Presence
freqencies
出现频率
Occurrence frequency
incidence frequency
occurrence
出现电位
appearance potential
appearance potentical
出现次数
Occurrence number
appearance times
Frequency of occurrence