Passive visual sensing method is the major method for sensing welding process, the principle of which is to capture weld pool image by the illumination of electric arc.

被动式视觉传感方法是焊接过程传感的一种主要方法，其主要原理是利用电弧光照射熔池表面获得熔池图像。

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Meanwhile, congressional efforts to encourage wealthy individuals to purchase low-income housing through the passive-loss provision had proven problematic as investors allowed their properties to decline to capture a greater tax write-off.

FORBES: For the 21st Century, a Network of Beneficial Philanthropy and Corporate Citizenship