Correct

增加 vs 增长

/ zēngjiā yus zēngzhǎng /
Strokes

Definition

增加 and 增长 both are Verbs, which means [increase; raise; grow].

Example

增加 stressing the increase in quantity is applied to concrete or abstract things and has wide usage, whereas 增长 not only indicates the increase in quantity but stresses the rise in level and is mostly applied to abstract things.
In the examples, only 增加 in example ④ can be replaced by 增长.
1
Chējiān
车间
yòu
zēngjiā
增加
le
tái
xīn
机器
  

There are a few more new machines in the workshop.

2
Zhè
xué
学期
bān
shàng
zēngjiā
增加
le
liǎng
wèi
xīn
tóngxué
同学
  

There are two new comers in our class this term.

3
yào
kòngzhì
控制
yǐnshí
饮食
  
,
zhòng
体重
néng
zài
zēngjiā
增加
le
  

You should be on diet,for you cannot put on any weight.

4
Zhège
这个
季度
gōng
工业
shēngchǎn
生产
zhí
yòu
zēngjiā
增加
  
(
zēngzhǎng
增长
  
)
le
bǎi
fēndiǎn
分点
  

The industry production has increased 4 percent this season.

5
Gōngchǎng
工厂
yào
zēngjiā
增加
chǎnliàng
产量
  
,
yào
zhù
注意
gāo
提高
chǎnpǐn
产品
de
zhìliàng
质量
  

A factory should not only pay attention to increasing the output, but also improving the products'quality.

6
Xiǎo
sūn
孙子
de
dàolái
到来
  
,
gěi
lǎorén
老人
de
shēnghuó
生活
zēngjiā
增加
le
duō
许多
乐趣
  

The old man derived great pleasure from his grandson's coming.

7
Yǒu
wèn
问题
jìnliàng
尽量
自己
jiějué
解决
  
,
biè
gěi
rénjiā
人家
zēngjiā
增加
fan
麻烦
  

Don't trouble others. You'd better deal with the difficulty yourself.

When 增长 means "the increase in quantity", the actual number is not used, but the percentage or fold.
8
Jīnnián
今年
quánshì
全市
zhuānyuànxiào
大专院校
zhāoshōu
招收
de
xīnshēng
新生
  
,
nián
去年
zēngzhǎng
增长
  
(
zēngjiā
增加
  
)
le
bèi
  

The enrollment of all the colleges in the city has increased double compared with that of last year.

9
Zhège
这个
chéngshì
城市
shāngpǐn
商品
de
chūkǒuliáng
出口量
zài
zhúnián
逐年
zēngzhǎng
增长
  
(
zēngjiā
增加
  
)
  

The goods export is increasing annually.

10
Zài
nián
de
gōngzuò
工作
shíjiàn
实践
zhōng
  
,
大大
zēngzhǎng
增长
le
cáigàn
才干
  

He has improved his abilities greatly these years.

11
Zhèxiē
这些
xué
科学
普及
读物
  
,
duì
zhōng
  
xiǎoxuéshēng
小学生
zhīshi
知识
de
zēngzhǎng
增长
hěn
yǒu
bāngzhù
帮助
  

These scientific books are helpful for the students of primary and secondary schools.

12
Chángcháng
常常
chū
出去
xíng
旅行
cānguān
参观
可以
zēngzhǎng
增长
jiànshi
见识
  

Traveling and visiting often can broaden your horizon.