By the early 1970s, age 40 and with a dozen books already behind him, Naipaul had reached an impasse in his life and work.

1970年代初，40岁、已出版了12本书的奈保尔，生活和工作一并走入死胡同。

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There are already over a dozen wearables on the market with many more coming.

FORBES: Age of Context Draft Introduction

Frequent airline travelers can already bypass immigration procedures at nearly a dozen North American airports by registering their palm prints with the Immigration and Naturalization Service.

CNN: Airport security aiming for new technologies