They certainly had soporific effect upon the Flopsy Bunnies!是什么意思？

They certainly had soporific effect upon the Flopsy Bunnies!

它们确实对佛洛普西家的小兔们有很强的催眠效果.

they

pron. 他/她/它们，人们，大家，政府，当局，她们；

例句
The storms had abated by the time they rounded Cape Horn.
他们绕过合恩角时，暴风雨已经减弱。

certainly

adv. 无疑，当然，确定，肯定；

例句
The Party was certainly not an official adjunct of the police department.
该党派肯定不是公安部门的官方附属机构。

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

soporific

n. 催眠的物质、药剂等；

例句
...the soporific effect of the alcohol.
酒精的催眠作用

effect

n. 影响，效果，印象，所有物；vt. 使发生，引起，产生（效果）；

例句
The police said Mr Hadfield's decision would have no adverse effect on the progress of the investigation...
警方称哈德菲尔德先生的决定将不会对调查的进展造成不利影响。

upon

prep. 在…上面，当…时候；

例句
...the doctrine of absolute monarchy based upon divine right.
以神权为基础的君主专制学说

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

bunnies

n. 兔子( bunny的名词复数 )；

例句
The Flopsy Bunnies followed at a safe distance.
那些佛洛普西小兔在安全距离内跟著他.