Expressing "to increase" with 增添 and 增加
增添 and 增加 have the same meaning, but differ slightly in usage.
The verb 增添
增添 
emphasizes a slight increase in something. The verb 增添 is usually used with something abstract.
For example: "to cause somebody trouble", "to give somebody courage", "to add charm to something".
emphasizes a slight increase in something. The verb 增添 is usually used with something abstract.
For example: "to cause somebody trouble", "to give somebody courage", "to add charm to something". Pay attention
增添 must be followed by an object.
Examples
医生鼓励的话语增添了他战胜病魔的勇气与信心
The doctor's words of encouragement gave him the courage and confidence to get over his illness
yīshēng gǔlì de huàyǔ zēngtiān le tā zhànshèng bìngmó de yǒngqì yǔ xìnxīn
音乐响起，为市场增添了欢乐
The market was full of fun when the music started playing
yīnyuè xiǎngqǐ, wèi shìchǎng zēngtiān le huānlè
落日给景色增添了伤感的气氛
The sunset makes me feel sad
luòrì gěi jǐngsè zēngtiān le shānggǎn de qìfēn
The verb 增加
增加 is used to indicate changes in quantity. The verb 增加 is usually used with something concrete.
For example: "to get an increase in pay", "to increase production".
is used to indicate changes in quantity. The verb 增加 is usually used with something concrete.
For example: "to get an increase in pay", "to increase production". Pay attention
增加 must not be followed by an object.
Examples
城乡居民收入持续增加
Urban and rural incomes continue to increase
chéngxiāng jūmín shōurù chíxù zēngjiā
我们必须增加产量
We must increase production
wǒmen bìxū zēngjiā chǎnliàng
短期合同会增加员工的流动率
Short-term contracts increase employee turnover
duǎnqī hétong huì zēngjiā yuángōng de liúdònglǜ
In some cases, 增加 can also be used with abstract nouns.
Examples
我不想给家里增添学费以外的负担
My family already pays my tuition fees, so I don't want to burden them with anything else
wǒ bù xiǎng gěi jiāli zēngtiān xuéfèi yǐwài de fùdān
我不想给家里增加学费以外的负担
My family already pays my tuition fees, so I don't want to burden them with anything else
wǒ bù xiǎng gěi jiāli zēngjiā xuéfèi yǐwài de fùdān