His death was totally unexpected.他的死完全出乎意料。

He made a brief, unexpected appearance at the office.他出人意料地在办公室露了一下脸。

Help may also come from some unexpected places.帮助也可能会来自一些意想不到的地方。

'Hello,' he said. 'This is an unexpected pleasure.'“嗨, ”他说, “这是一个意外之喜。”

There have been unexpected delays.出现了一些意外的延误。