To discuss the strictly positive realness judgment criteria of singularly perturbed systems, a singular system model is employed, and the existing positive real lemma of singular systems is improved.

利用广义系统模型，通过改进已有的广义系统正实引理，讨论了奇异摄动系统的正实性判断问题。

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Conservation supporter Caitlin Gaffey says she's not sold that the new areas cover enough ground to make a positive impact on the underwater eco-system.

NPR: California Cuts Coastal Fishing to Restore Ecosystem

The FSA rejects the idea that it introduced the positive release system only in response to the crisis - it said it was going to happen anyway.

BBC: FSA delayed plans to test every horse before crisis

Commenting on the meeting convened by PM Kan on February 5, the Yomiuri Shimbun appealed to all political parties to refrain from political posturing and advantage-seeking, and to join in positive, constructive discussion in order to reinforce the welfare system.

FORBES: Vested Interests in Japan's Social Welfare System