solid
单词辨析：
指不软也不是特别硬，但不易变形的。
She can't sleep well on a firm mattress.
她在硬床垫上睡不好。
He bought several firm green apples on his way home.
他在回家的路上买了几个硬的青苹果。
指硬实得难以按下、切开、弄碎等的。
This piece of rock is so hard that you can barely embed anything in it.
这块岩石太硬了，几乎什么也嵌不进去。
There was almost no rain this year so the ground is now as hard as stone.
今年一年几乎没下雨，现在土地硬得像石头一样。
指材料很硬，很难或无法弯曲的。
Be careful! This kind of plastic is inflexible.
小心！这种塑料不能弯曲。
相关例句：
Solid low-level waste will be disposed of deep underground
放射性水平低的固体废料将做地下深埋处理。
I've always felt that solid experience would stand me in good stead.
我总觉得实实在在的经历会对我有利的。
The car park was absolutely packed solid with people.
停车场被人挤得水泄不通。
He has a solid alibi.
他有不在场的确凿证据。
The taps appeared to be made of solid gold.
水龙头似乎是用纯金制成的。
The solid feel of the car's shell is impressive.
这辆汽车的外壳给人的感觉异常坚固。