this certificate ls presented中文意思是什么?

this certificate ls presented中文意思是什么? 英语ls this your ls this your ls this the ls this your school? ls this ( ) english book?( )中填啥? ls this a picture是什么意思 ls++this++your++school是什么意思 ls this new calculator _____? ls this...for...怎么填 Certificate certificate Certificate ls. ls this question easy 的意思是什么? ls this question easy?的回答是什么 ls this your computer?改为肯定陈述句 ls this a bus复数句