As you move onto the more expensive zoom lenses, they maintain a constant aperture.
当你继续研究比较昂贵的变焦镜头时，你会发现它们有着恒定的光圈。
The basic function of a reference electrode is to maintain a constant electrical potential.
参比电极的基本功用是维持一个恒定的电能。
Thus, a constant tension exists that presses you to maintain a robust image.
于是，你在这样持续的压力下就给人一种拼命三郎的印象。
Thus, a constant tension exists that presses you to maintain a robust image.
于是，你在这样持续的压力下就给人一种拼命三郎的印象。
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