The conjunctive adverb 亦
We use the conjunctive adverb 亦 
to complete a statement.
It should be stated before a predicate which is expressed by a verb or a verb phrase.
to complete a statement.
It should be stated before a predicate which is expressed by a verb or a verb phrase.Scheme
subject
亦
predicate
Pay attention
We usually use 亦 in formal speech.
Examples
它们亦用于杀菌
It can be also used for sterilization
tāmen yì yòng yú shājùn
若能从失败中获得教训，失败亦是成功
If you can learn from failure, then failure can also also be success
ruò néng cóng shībài zhōng huòdé jiàoxùn, shībài yì shì chénggōng
芬兰北部的空中交通亦处于停顿状态
Air traffic in northern Finland is also at a standstill
fēnlán běibù de kōngzhōng jiāotōng yì chǔyú tíngdùn zhuàngtài