Ladders are made from two long pieces of wood, metal, or rope with a series of steps, called rungs, between them.

梯子由两根长长的木头、金属或绳子以及它们之间的一系列梯级组成，这些梯级被称为横档。

Umm, sweetie, but I was thinking of a more modern style house. An open concept house, all glass, wood, metal, and concrete.

额，亲爱的，我更想要一个现代风格的房子—一个开放式的概念空间，所需材料全由玻璃，木材，金属以及水泥建造。

After the war, plastic stuck around replacing wood, metal, and paper in industry after industry.

战后，塑料在一个又一个行业中取代了木材、金属和纸张。

The researchers documented the number of microdebris-measuring between 2 and 5 millimeters-and larger pieces, like wood, metal and plastic, on 25 beaches in 2017.

研究人员记录了2017年25个海滩上的微碎片(测量范围在2到5毫米之间)和更大的碎片(如木头、金属和塑料)的数量。

A threshold is a piece of wood, metal, or stone that lies across the base of a doorway.

门槛是位于门口底部的一块木头、金属或石头。

Ladders are made from two long pieces of wood, metal, or rope with a series of steps, called rungs, between them. We climb the rungs to reach higher up.

梯子由两根长木头、金属或绳子制成，梯子之间有一级一级的踏板，称为台阶。爬梯子是为了到达更高的地方。