as a rule 通常；一般来说；照例

【例句】
As a rule, you search on what you see, not what you think Access stores in the table.
通常，您应当搜索看到的内容，而不是您认为Access在表中存储的内容。

As a rule, however, such attacks have been aimed at causing damage rather than taking life.
然而，通常此类袭击只是为了造成破坏，并非要人性命。