Grammar Note
通常作不可数名词；表示不同种类或具体板材时可用复数 cardboards。
硬纸板；纸板
先理解核心含义，再看它在真实句子里的用法。
硬纸板；纸板
a stiff, thick paper material made from wood, used for making boxes, cartons, and signs
The movers wrapped the dishes in cardboard before packing them.
搬家工人把盘子用纸板包好后再装箱。
一种类似厚纸的木质材料,用于制造箱子、纸箱和标牌
A wood-based material resembling heavy paper, used in the manufacture of boxes, cartons and signs.
一种坚硬且中等厚度的纸
a stiff moderately thick paper
平坦或空洞的事物
Something flat or insubstantial.
非洲肉豆蔻(Pycnanthus angolensis)的同义词
Synonym of African nutmeg (“Pycnanthus angolensis”).
A layer of cardboard under the mattress made the bed feel firmer.
床垫下垫了一层纸板，床就感觉更硬了。
She cut the cardboard into pieces and painted them for a school project.
她把纸板剪成小块并涂上颜料，用于学校作业。
Choose the next layer that will help you use cardboard with more confidence.
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通常作不可数名词；表示不同种类或具体板材时可用复数 cardboards。
该词属于 Oxford 核心词汇，值得优先掌握常见搭配和句型。
Collins 词频等级为 1，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.