她的确精力充沛。用英语怎么说？

她的确精力充沛。

She's certainly brimful of energy.

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。

brimful

adj. <尤英>装满…的，充盈的，满当；

例句
She was brimful of energy and enthusiasm...
她精力充沛，热情洋溢。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

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

energy

n. [物]能量，活力，精力，精神；

例句
A household radiator absorbs energy in the form of electric current and releases it in the form of heat.
家用取暖器吸收电流能量，再以热量的形式释放出来。