In hot weather it is rather difficult to preserve food and keep it fresh and safe to eat.
热天很难保藏食品，使之保持新鲜与食用安全。
Pebbles and gravel also insulate the soil to keep surface temperatures low and preserve water.
小石头、砂砾层也可用来做隔绝层，以保持水分，降低土壤的温度。
This helps to preserve the vegetables and to keep them firm and fresh.
这就可以保持蔬菜的新鲜和结实。
Thou shalt keep them, o LORD, thou shalt preserve them from this generation for ever.
耶和华阿，你必保护他们。你必保佑他们永远脱离这世代的人。
Try to keep the height of your original document to preserve the good quality.
尽可能保持高度，你原有的文件，以维护良好的质量。
Try to keep the height of your original document to preserve the good quality.
尽可能保持高度，你原有的文件，以维护良好的质量。
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