strayer

1. Psychologists Jason Watson and David Strayer said their findings were important because they prove the vast majority of us can't do more than one thing at a time.
   心理学家贾森·沃森和大卫·斯特耶认为他们的发现很重要，因为他们证明了我们中绝大多数人无法在同一时间做一件以上的事情。

noun

1. someone who strays or falls behind

   Synonym:    straggler