1
the joists support [something]
joists 常用复数，因为托梁通常是成组使用的。
The steel joists support the concrete floor.
钢托梁支撑着混凝土楼板。
托梁；桁
先理解核心含义，再看它在真实句子里的用法。
托梁；桁
a beam used to support floors or roofs
The steel joists support the concrete floor.
钢托梁支撑着混凝土楼板。
水平或近水平铺设的木梁或钢梁,固定地板或天花板之用。
A piece of timber or steel laid horizontally, or nearly so, to which the planks of the floor, or the laths or furring strips of a ceiling, are nailed.
The carpenter checked each joist before installing the new floor.
木匠在安装新地板之前检查了每一根托梁。
We need to replace a rotten joist under the living room floor.
我们需要更换客厅地板下面一根腐烂的托梁。
The roof joists are spaced evenly to support the heavy tiles.
屋顶的托梁均匀排列，用来支撑沉重的瓦片。
joists 常用复数，因为托梁通常是成组使用的。
The steel joists support the concrete floor.
钢托梁支撑着混凝土楼板。
between the joists 表示空间位置，常作状语。
Pipes are often hidden between the joists.
管道常常隐藏在托梁之间。
The builder installed new joists under the floor.
建筑工人在地板下安装了新的托梁。
Not this
There are many joist under the floor.
Use this
There are many joists under the floor.
joist 是可数名词，many 后要用复数形式 joists，漏掉 -s 是常见的复数标记错误。
Not this
This joist are made of wood.
Use this
This joist is made of wood.
joist 在这里是单数名词，作主语时谓语动词要用 is 而不是 are，主谓必须一致。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
地板托梁
The workers installed the floor joists before laying the plywood.
工人们在铺设胶合板之前安装了地板托梁。
天花板托梁
The ceiling joists are hidden above the drywall.
天花板托梁隐藏在石膏板上面。
钢托梁
Steel joists are often used in commercial buildings.
钢托梁常用于商业建筑。
木托梁
These wooden joists need to be treated against moisture.
这些木托梁需要做防潮处理。
托梁间距
The joist spacing depends on the load the floor will carry.
托梁间距取决于地板要承受的荷载。
Use joist naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 joist 记成 joy + st：地板下的托梁稳稳托住，让你走上去安心快乐。
语域：mixed 常见场景：construction、architecture、engineering 在建筑、工程等专业场合中属于常用中性词；在日常用语中很少出现，多用于技术描述。
在给出的发音中，joist /dʒɒist/ 与 hoist、moist、foist 押韵，它们都以 /ɒɪst/ 结尾。注意拼写相近但发音不同的词：jest /dʒɛst/ 和 just /dʒʌst/ 与 joist 的元音不同；joint /dʒɒɪnt/ 虽有相同的元音，但以 /nt/ 结尾而不是 /st/，因此不押韵。
Dictionary facts from ECDICT, WIKTIONARY.