Early film photographers shied away from capturing night scenes because these require prohibitively long exposures to maintain adequate depth of field, or produced unacceptable amounts of image noise.

早期胶卷相机使用者对夜间摄影避而远之，原因在于，或者是合适景深所需的长时间曝光无法达到，或者是产生太多噪点。

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Its welded black metal screens visually delimit the space and maintain the full depth of field of the entire volume.

其黑色金属焊接的屏幕视觉上划定了空间，维护整个体块区域的景深。

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Actively build and maintain good customer relations and mutual trust, and tap the depth of cooperation with our customers long-term business opportunities.

积极建设并维护良好、互信的客户关系，挖掘与客户长期深度合作的商业机会。

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Maintain close professional relations with national experts, officials, and high level authorities to obtain an in-depth understanding of sensitive matters of educational development in Mexico, thus setting up the basis for a smooth cooperation and workplans for the implementation of activities.

UNESCO: Vacancy : Programme Specialist (Education) (19/9/2011) LA/RP/MEX/ED/0003 - (P4)