You use otherwise before stating the general condition or quality of something, when you are also mentioning an exception to this general condition or quality. 除此以外
adverb [方式副词]否则,不然;除此以外,在其他方面;不同地,另外地;以其他方式,用别的方法
Make a note of the questions you want to ask; you will invariably forget some of them otherwise. 把你想问的问题记下来;否则你准会忘记其中几个。
adjective [原级]不是那样的,另外情况下的
It was for the police to assess the validity or otherwise of the evidence. 应由警方来评价证据的有效与否。