英文释义

pron. Which (of two); which one (of two); -- used

interrogatively and relatively.

conj. In case; if; -- used to introduce the first or two or

more alternative clauses, the other or others being connected by or, or

by or whether. When the second of two alternatives is the simple

negative of the first it is sometimes only indicated by the particle

not or no after the correlative, and sometimes it is omitted entirely

as being distinctly implied in the whether of the first.