(informal)without any doubt
(非正式)无疑地，确确实实地
it's a bad business and no mistake.
毫无疑问，这一情况很不妙。
accidentally; in error
意外地；错误地
she'd left her purse at home by mistake.
她意外把钱包留在家里了。
(informal)do not be deceived into thinking otherwise
(非正式)不用有任何疑问，完全可以肯定
it is impossible not to recognize someone or something
（人或物）不可能被认错