longtime
adj. 长时间的；为时甚久的
adv. 长久地
例句
He's stunned by today's resignation of his longtime ally.
他被自己的长期助手今天的辞职所震惊。
《柯林斯英汉双解大词典》
Sun Microsystems gave up its legal fight with Microsoft and agreed to cooperate with its longtime nemesis.
太阳微系统放弃了和微软的官司，与这家自己竞争了多年的主要对手携手合作。
The gathering was organized by Warren Buckleitner, a longtime reviewer of interactive children's media.
这次聚会是由沃伦·巴克利特纳组织的，他是一位资深的儿童互动媒体评论家。
