2023年山东省济宁市中考 – 阅读理解D

Making invisible ink is a lot of fun. All you need is some common objects。
制作隐形墨水很有趣。你所需要的只是一些普通物品。

What you'll need:
你需要：

• Half a lemon *Water *Spoon *Bowl
  *半个柠檬 *水 *勺子 *碗

*White paper *Cotton bud * Light bulb
*白纸 *棉签 *灯泡

Instructions
制作说明

1. Squeeze some lemon juice into the bowl and add a few drops of water
   1.往碗里挤些柠檬汁，加几滴水

2.Mix the water and lemon juice with the spoon.
2.用勺子把水和柠檬汁混合。

3.Put the cotton bud into the mixture and write a message onto the white paper
3.将棉签放入混合液中，并在白纸上写字

4. Wait for the juice to dry so it becomes completely invisible
   4.果汁变干后，就会消失不见

5. When you are ready to read your secret message or show it to someone else, heat the paper by holding it close to a light bulb
   5.当你准备阅读你的秘密信息或向别人展示时，将纸靠近灯泡加热

What's happening?
发生了什么？

Lemon juice turns brown when heated. Putting some water in the lemon juice makes it very hard to notice when you put it on the paper. Other things which work in the same way include orange juice honey, milk, onion juice and even more
柠檬汁加热后会变成棕色。在柠檬汁中加入一些水，当你在纸上写字时，很难发现。其他同样有效的东西包括橙汁、蜂蜜、牛奶、洋葱汁等等。