1.(inevitably)必然地；必定地；不可避免地
Decisions were necessarily slow.决定必然不是一时半会就能作出的。
Tourism is an industry that has a necessarily close connection with governments.旅游业是与政府有着必然的密切联系的产业。
2.not necessarily
(indicating something might not be true)不一定, 未必(用作回答)
He was lying, of course.—Not necessarily.毫无疑问, 他在说谎。——不一定。
So we're trapped.—Not necessarily.这么说我们上当了。——那倒未必。