1
be made of hardwood
hardwood 作不可数名词，表示硬木这种材料。
The dining table is made of hardwood.
这张餐桌是用硬木做的。
硬木；阔叶木材
先理解核心含义，再看它在真实句子里的用法。
硬木；阔叶木材
hardwood
The dining table is made of hardwood.
这张餐桌是用硬木做的。
任何双子叶树木的木材,不论其硬度如何。
The wood from any dicotyledonous tree, without regard to its hardness.
阔叶树的木材
the wood of broad-leaved dicotyledonous trees (as distinguished from the wood of conifers)
更通用的说法:指上述木材,但限于商业用材且至少为中等硬度。
(in more general use) As the preceding, but limited to those that are commercial timbers, and are at least average in hardness.
产出上述木材的树木或树种。
The tree or tree species that yields the preceding.
This table is made of solid hardwood.
这张桌子是用实心硬木做的。
Most hardwoods, such as oak and maple, are heavy and strong.
大多数硬木，如橡木和枫木，又重又结实。
The carpenter chose hardwood for the kitchen floor because it lasts longer.
木匠选择硬木铺厨房地板，因为它更耐用。
hardwood 作不可数名词，表示硬木这种材料。
The dining table is made of hardwood.
这张餐桌是用硬木做的。
hardwood 作定语时通常用单数形式，修饰由硬木制成的物品。
They installed hardwood floors in the kitchen.
他们在厨房安装了硬木地板。
表示某一具体的硬木种类时用 a hardwood；复数 hardwoods 可指多种硬木或硬木树种。
Oak is a hardwood, while pine is a softwood.
橡木属于硬木，而松木属于软木。
Not this
The table is made of hardwoods.
Use this
The table is made of hardwood.
hardwood 指材料时是不可数名词，不加 -s；hardwoods 只能指不同种类的阔叶树材，不能泛指木材本身。
Not this
I want to install hard wood floors.
Use this
I want to install hardwood floors.
hardwood 是固定合成名词，指阔叶树材；写成 hard wood 就变成了“质地硬的木头”，语义不同。这里表示地板材质，应该用一个词 hardwood。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
硬木地板
They installed a beautiful hardwood floor in the living room.
他们在客厅铺了漂亮的硬木地板。
硬木森林
The region was once covered by dense hardwood forest.
该地区曾被茂密的硬木森林覆盖。
硬木木材
This company exports high-quality hardwood timber.
这家公司出口优质硬木木材。
硬木树
Oak is a type of hardwood tree.
橡树是一种常见的硬木树。
硬木树种
Many hardwood species are threatened by illegal logging.
许多硬木树种受到非法伐木的威胁。
（比喻）篮球场；篮球运动
The rookie is ready to play on the hardwood tonight.
这名新秀准备好今晚在篮球场上比赛了。
上场打球（尤指篮球比赛）
After the injury, she was eager to hit the hardwood again.
受伤之后，她渴望再次上场比赛。
发短 /ʊ/ 音 (如 good, book)
Use hardwood naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
拆开即 hard（硬）+ wood（木），想象一块阔叶树木板敲起来梆梆硬；hardwood 就是硬木。
语域：neutral 常见场景：木工与建材、家具与地板 hardwood 指阔叶树的木材，属于中性的常用说法，口语和书面语中都自然，通常用于木材加工、家具或地板等具体场景；没有明显的正式或非正式之分。
hardwood 指阔叶树材，与物理硬度无关。
Dictionary facts from ECDICT, WIKTIONARY.