坚硬的英文：
hard
solid

参考例句：

As hard as iron
非常坚硬，极其坚强

The horny part of the jaws of a bird;a beak.
啄鸟嘴的坚硬部分;啄

Kentish rag
肯特郡产坚硬砂质石灰岩

Topaz is one of the hardest gem minerals.
黄水晶是非常坚硬的宝石矿中的一种。

The hard,siliceous bivalve shell of a diatom.
硅藻细胞壳硅藻的坚硬含硅的硬壳

nut of any of various walnut trees having a wrinkled two-lobed seed with a hard shell.
各种胡桃树的有着具皱的两瓣果实和坚硬的果壳的果实。

The new shark was dubbed the diamond shark, in honor of the diamond hard ridges on its flanks.
为了向它侧腹如钻石般坚硬的背脊致敬，这种新鲨鱼被称作钻石鲨。

A dessert of firm, smooth custard with a topping of caramel syrup.
果酱饼一种有坚硬的光滑酥皮且顶部有焦糖色果汁的甜点心。

A very hard,dense,even - textured,silica - bearing sedimentary rock used in whetstones.
均密石英岩非常坚硬，致密，结构均匀，含硅的沉积岩，用作磨石

A rigid framework, as of wooden beams or metal bars, designed to support a structure, such as a roof.
桁架用木棒或金属棒做成的坚硬的构架，用于支撑屋顶等结构

hard是什么意思：
adj. 硬的，坚固的；困难的；有力的；冷酷无情的
adv. 努力地；困难地；严重地，猛烈地

It is hard to conclude.
这很难断定。

It is blowing hard.
风刮得很大。

It was sleeting hard.
雨雪霏霏。

To bear hard upon;press.
使痛苦不堪对某人施加困难；逼迫

press hard upon
进逼|压迫|穷追

solid是什么意思：
adj. 固体的；坚固的；实心的；纯的；一致的
n. 固体，立体图形，立方体

on solid ground
在稳固的基础上

An extremity of a solid is a surface.
立体的边界之一是一个面。

To become compact or solid;cohere.
凝固使坚实或变硬；粘着紧凑

This spoon is solid silver.
这把汤匙是纯银的。

These curtains are solid blue.
这些窗帘是纯蓝色的。