英语what a lovely day等于how fine the day

how lovely the day is!
e.g.
How+形容词或副词+ 陈述语序
What +名词+ 陈述语序
What+a+形容词+名词+ 陈述语序
What+ 形容词+复数名词+ 陈述语序
What+ 形容词+不可数名词+ 陈述语序
How clever a boy he is!
How lovely the baby is!
What noise they are making!
What a clever boy he is!
What wonderful ideas (we have)!
What cold weather it is!
感叹句的省略形式为：What a clever boy (he is)!

意思差不多

等于

差不多

表明的意思是一样的，只是表达的方式不同罢了