The only constant of friendship to the test of, or permanent sincerity.
⊙、对友情唯一不变的考验，还是长久不变的真诚。
However, over time constant visual stress may lead to a permanent reduction in distance vision.
然而，经常性的视疲劳会造成永久性的远视力下降。
However, over time constant visual stress may lead to a permanent reduction in distance vision.
然而，经常性的视疲劳会造成永久性的远视力下降。
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