Fill ice cube trays with lemon juice. Once frozen, store the cubes in a plastic resealable bag. This way you always have fresh lemon juice on hand.
在制冰盒中装满柠檬汁。冷冻后，把冰块储放在可再次密封的塑料袋中。这样你在手边随时都有新鲜的柠檬汁。
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After lying for hours on cold ground, with only a thin sleeping bag to protect you from rain or ice, your fingers would probably be so numb that you could hardly move them.