in case (something happens); once (something becomes true, then...); in one day[cedict]
确定
què dìngㄑㄩㄝˋ ㄉㄧㄥˋ
definite; certain; fixed; to fix (on sth); to determine; to be sure; to ensure; to make certain; to ascertain; to clinch; to recognize; to confirm; OK (on computer dialog box)[cedict]
发生
fā shēngㄈㄚ ㄕㄥ
to happen; to occur; to take place; to break out[cedict]