Performance is lowest between 3 a.m. and 5 a.m., and reaches a peak near midday...是什么意思？

Performance is lowest between 3 a.m. and 5 a.m., and reaches a peak near midday...

凌晨3点至5点表现最差，近中午时分最好。

performance

n. 表演，演技，表现，执

例句
...a charity performance in aid of Great Ormond Street Children's Hospital.
为给大奥蒙德街儿童医院筹资而举办的慈善演出

is

vt.& vi. 是（be的三单形式；n. 存在；

例句
Bollinger 'RD' is a rare, highly prized wine.
博林格RD香槟是一种名贵的备受推崇的葡萄酒。

lowest

adj. 最低的，最底下的，最小的；

例句
Oil prices fell this week to their lowest level in fourteen months, apparently because of over-production.
据说因为产量过剩，这个星期石油价格跌至14个月以来的最低点。

between

prep. 在…之间，私下，暗中，在…中任择其一，来往于…之间；adv. 当中，中间；

例句
How big is the abyss between what you think you are and what you actually are?
你对自己的认识和真实的你之间差别到底有多大？

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

reaches

n. 河段；流域；（上、中或下）游，（外）围；（远）处，（组织或机构中的）层级；

例句
And now the story reaches a crescendo.
现在故事进行到了高潮。

peak

n. 山峰，最高点，尖端，帽

例句
The move is designed to boost sales during the peak booking months of January and February.
这一举措旨在增加1月和2月预订高峰期的销售量。

near

adv. （空间）在近处，在附近，（时间）临近，（程度）几乎；prep. （表示程度）接近，（表示位置）靠近，（表示时间）将近，接近于（某种状态）；adj. 近的，亲密的，近似，（亲属关系）近亲；

例句
Doctors have decided the only way he can live anything near a normal life is to give him an operation...
医生的结论是只有做手术，他才有可能过上基本正常的生活。

midday

n. 中午，正午；adj. 正午的；

例句
...the broiling midday sun.
正午灼热的太阳