Correct

结实 vs 坚固 vs 牢固(近义词)

/ Jiēshí yus jiāngù yus láogù /
Strokes

Definition

strong,durable/ solid,strong/ solid

Example

用法1
1)All the three adjectives mean"strong",but 坚固 and 牢固 are applied to things only and 结实 can also be applied to a person's health.Of the three 结实 is the most frequently used in colloquial language and can be reduplicated into 结结实实.牢固 is more literary,mostly applied to abstract things.
2)In all the three examples above,坚固 can be used instead in example②,but is not very colloquial.If 牢固 is used in example③,it cannot be reduplicated.
1
Lǎorén
老人
de
shēn
身体
shí
fēn
jiēshí
结实
  

The old man is very strong.

2
Zhège
这个
zhuōzi
桌子
zuò
de
zhēn
jiēshí
结实
  

The table is very endurable.

3
Bèi
kǔn
de
jiējiēshíshí
结结实实
de
  
,
shùshī
魔术师
zhǎyǎn
眨眼
jiù
jiětuō
解脱
le
  

The magician freed himself in an instant though he was tied tightly.

用法2
1)In example①above,结实 can also be used instead.In example② 牢固 can be used instead.
4
Zhèxiē
这些
jiā
家具
jiān
坚固
nàiyòng
耐用
  

These furniture are sturdy and durable.

5
Zhè
dǐng
zhàngpeng
帐篷
tài
jiān
坚固
  
,
wǎnshang
晚上
yǒu
fēng
大风
  
,
yào
jiā
加固
xià
  

The tent is not fixed well.It is going to be windy,so please anchor it.

6
zhī
qiúduì
球队
yánfáng
严防
shǒu
死守
  
,
似乎
xíngchéng
形成
le
jiān
坚固
de
zhèn
阵地
  
,
shǐ
使
duìshǒu
对手
无法
突破
  

The defense of the team is tight,and it seems like an invincible front that the rivals cannot defeat.

用法3
1)All the three examples above are about abstract things and so neither of the other two words can be used. But in example②of2,牢固 can be used,that means,牢固can sometimes be applied to concrete things.
7
Liǎng
guó
jiéchéng
结成
le
láo
牢固
de
yǒu
友谊
  

There is solid friendship between these two countrys.

8
men
他们
zhījiān
之间
jīng
已经
xíngchéng
形成
le
láo
牢固
de
tóngméng
同盟
guānxi
关系
  

They have firm alliance.

9
Jīngguò
经过
duō
多次
复习
  
,
zhèxiē
这些
shēng
生词
jīng
已经
de
记得
hěn
láo
牢固
le
  

He can remember these new words well after repeating a lot of times.