on; on top; upon; first (of two parts); previous or last (week etc); upper; higher; above; previous; to climb; to go into; above; to go up; to attend (class or university); third tone of putonghua[cedict]
突然
tū ránㄊㄨ ㄖㄢˊ
sudden; abrupt; unexpected[cedict]
出现
chū xiànㄔㄨ ㄒㄧㄢˋ
to appear; to arise; to emerge[cedict]
一
yīㄧ
one; 1; single; a (article); as soon as; entire; whole; all; throughout[cedict]