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鉛筆是由什么做成的英語作文

2025年01月25日 06:42

Pencils are one of the most common stationery items. The core of a pencil is mainly made from a combination of graphite and clay. This composition makes the pencil tip hard and less prone to breakage. The graphite provides the marking ability, while the clay helps adjust the hardness and darkness of the lines. In the early days, pencils were made using lead. However, as lead is toxic and has poor color-displaying ability, it was soon replaced. Later, graphite was discovered and became the main material for making pencils. Graphite is soft and leaves clear marks on paper. Over time, the manufacturing process of pencils has evolved. Now, in addition to the core, pencils also have a wooden casing to protect the core and make them easier to hold and use. In conclusion, pencils are made of graphite, clay, and a wooden casing, which together make them a useful tool for writing and drawing. 點擊前往免費閱讀更多精彩小說

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