Protocol buffers supports optional, required and repeated fields. An example of an address book message definition using protocol buffers would look like this.

Protocol buffers支持可选的，必需的和重复的字段。

youdao

This seemingly irrational line has been repeated in every possible permutation, on every possible occasion, e.g. "What big brother is reading not a book, but loneliness."

这句看上去很无厘头的话被用在了所有场合下的所有可能搭配的排列中，比如，“哥看的不是书，是寂寞。”

youdao

I'm sorry I repeated a book.

我抱歉我重复了一本书。

youdao

As repeated readings broke the spine of the book, and tiny-finger fondling mangled the pages, we bought a replacement.

FORBES: Play It Again

The tutor first reads the book aloud to students first so that they understand and remember the repeated phrases.

UNESCO: Adult Literacy Tutors Association (ALTA)