前卫的（形容词，非正式）

(adjective, INFORMAL) Describing someone or something always trying to evolve or improve by adopting modern practices.

EXAMPLE: Despite being quite elderly, my forward-looking grandfather always uses the latest technology and frequently tries new ways of doing things.

尽管年事已高，我的前卫的祖父总是使用最新的技术，并经常尝试做事的新方法。

to drift off to sleep

渐渐入睡

To slowly and gently fall asleep. (NOTE: also "to drift off")

EXAMPLE: When our boring company president gives a particularly long and tedious speech, some audience members will drift off to sleep.

我们公司乏味的总裁发表了特别冗长沉闷的演讲，部分听众慢慢睡着了。