Head and shoulder detection is one of the important problems on human body analysis. It is the first step of face detection and the base of pedestrian detection.

头肩图像检测是人体分析研究中受关注的研究方向，是人脸检测的第一步，也是行人检测的基础。

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They face in the opposite direction and you could predict the properties of one from base pairing rules of the other but they're not the same.

它们是反向的,尽管你能够通过一条链上的碱基序列,预测另一条链的序列,但这两条链是不同的

耶鲁公开课 - 生物医学工程探索课程节选

Racers follow the stream -- jumping off small cliffs and through waterfalls -- and a final rock face at the base creates one of the last challenges, requiring concentration and crab-walking to climb down.

BBC: An Alaskan-style Fourth of July

The upturned face of one of the three Marys kneeling at the base of the crucifixion (shown above) has the radiant purity of someone whose worldly preoccupations have been sucked away by grief.

ECONOMIST: Rogier van der Weyden