The present study investigates relationships between three modalities of vocabulary knowledge (passive recognition, active recall and free active written) within two different learning contexts.

本研究探讨了三层面英语词汇量的关系：消极认知、积极回忆和写作词汇。

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Automatic recognition of underwater targets is one of the key techniques in modern passive sonar systems.

在现代被动声纳系统中，水下目标的自动识别是关键技术之一。

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The techniques of feature extraction, feature selection and design of classifier for passive sonar target recognition are reviewed.

文章对被动声纳目标识别的特征提取、特征选择和分类器设计方面进行了回顾。

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As OEMs also look to implement more flexible input options for consumers, the Synaptics ClearPad 3400 allows simultaneous pen and finger touch recognition, passive pen tracking with pinpoint accuracy, and linearity and jitter control that functions with any number of fingers and styluses as small as 2mm.

ENGADGET: Synaptics launches a pair of mobile touchscreens at MWC 2013

The reality is that small touchscreen devices and voice recognition are better suited for searching, and due to the passive nature of TV viewing, I think people want to browse first and search second.

ENGADGET: Editorial: What's wrong with TV, and what it might take to change it