I spent many hours mindlessly banging a tennis ball against the wall.是什么意思？

I spent many hours mindlessly banging a tennis ball against the wall.

我好几个小时都在机械地往墙上打网球。

spent

adj. 用过的，不再有用的，已废的，失效的；v. 用钱，花钱( spend的过去式和过去分词 )，花费，消耗，花（时间）；

例句
He has spent money with gay abandon...
他肆意挥霍钱财。

many

adj. 许多，多的；pron. （与复数动词连用）大多数人；

例句
There are many people who still find the act of abortion abhorrent.
仍有很多人对堕胎行为表示厌恶。

hours

n. 小时( hour的名词复数 )，固定时间，一小时的时间或行程，重要时刻；

例句
The workforce have recently been calling for their working hours to be reduced. Many companies have accordingly switched to a five-day week.
工人们最近一直在呼吁缩短工作时间。许多公司于是转成了一周五天工作制。

mindlessly

--

例句
I spent many hours mindlessly banging a tennis ball against the wall.
我好几个小时都在机械地往墙上打网球。

banging

vt. 猛击，猛撞（bang的现在分词形式）；

例句
She sighed, her heart banging away against her ribs as she opened the door.
她叹了口气，开门时心一直在怦怦直跳。

tennis

n. 网球（运动）；

例句
...a tennis ball.
网球

ball

n. 球，棒球（投手投出的）坏球，拇指球，舞会；vt. 做成球状，使成团块，（指男性）和（女性）交媾（美式英语）；vi. 呈球形，成团块，[美国俚语、口语]狂欢作乐，消遣，尽情作乐，尽情地玩；

例句
The ball hit him in the most sensitive part of his anatomy.
球击中了他身上最敏感的部位。

against

prep. 反对，对…不利，紧靠，以防；

例句
His hand brushed against hers; it could have been either accidental or deliberate.
就在有意无意间，他的手轻轻拂过她的手。

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。

wall

n. 墙，屏障，隔阂，壁垒；vt.& vi. 筑墙围住，用墙隔开，围以墙；adj. 墙壁的；

例句
On a table pushed against a wall there were bottles of beer and wine.
在一张靠墙的餐桌上有啤酒和葡萄酒。