A2 used to reply completely or to emphasize something and show that there is no doubt about it:A2 used to reply completely or to emphasize something and show that there is no doubt about it:
She certainly had a friend called Mark, but I don\'t know whether he was her boyfriend.
A2 used to reply completely or to emphasize something and show that there is no doubt about itA2 used to reply completely or to emphasize something and show that there is no doubt about it
（用于肯定的答复或强调）当然，毫无疑问，确实，肯定 She certainly had a friend called Mark, but I don\'t know whether he was her boyfriend. 她确实有个朋友叫马克，不过我不知道他是不是她男友。
