The tests are designed to detect subtle ( ' , 細微的) changes in mental function, and involve solving puzzles, recalling words and details from stories, and identifying patterns in collections of letters and symbols.

The tests are designed to detect subtle changes in mental function, and involve solving puzzles, recalling words and details from stories, and identifying patterns in collections of letters and symbol.

LOL has evolved into something much subtler and sophisticated and is used even when nothing is remotely amusing.

Critics point out that, by giving Google the right to commercially exploit its database, the settlement paves the way for a subtle shift in the company's role from provider of information to seller.

Often the advantages of convenient, mobile technology are both obvious and taken for granted, leaving more subtle topics for concerned discussion.