▲在网上查了一下，你的句子出自一部电影《自由持有》（Hands Of Love）的插曲。原句是没有逗号的，即：There'll be an endless sea of us rising up （将有我们无数的人起来反抗）

▲其中的 a sea of… 是个常用短语，意思是“大量的，茫茫一片的”，若需加强语气，其中的 sea 也可以受 endless, vast 等形容词修饰。如：

a sea of flame 一片火海

a sea of faces 无数张面孔，人山人海

a sea of multicoloured umbrellas. 五颜六色的伞的海洋

I stood amid a sea of corn. 我站在茫茫一片庄稼之中。

We saw a sea of people in the square. 我们在广场上看见一片人山人海。

Vast crowds had churned the field into a sea of mud. 大批大批的人把场地踩得一片泥泞。

She scanned the vast sea of faces below her.  她扫视了一下下面的无数张面孔。

The actor looked out from the stage onto a sea of faces. 那演员从舞台上往下看去，见到的是黑压压的一大片面孔。

▲你的句子涉及句式为：There be+sb/sth+doing sth

There is someone waiting for him. 有人在等他。

There’s a dog lying on the floor. 地上躺着一条狗。

There were no soldiers drilling. 没有士兵在操练。

There was a party going on next door. 隔壁正在搞聚会。

There are hundreds begging in the streets. 街上有数以百计的乞丐。

There’ll be somebody meeting you at the airport. 会有人在机场接你。

There was a fire burning in the large fireplace. 大壁炉里火势正旺。

语法分析：这类句式中的现在分词短语为定语，修饰前面的名词或代词。

▲附 Hands Of Love 歌词（来自网络，其中的翻译不一定对，仅供参考）：

When the white flag sails covered in streaks of blood

缕缕血色下，白旗扬帆远航

There'll be an endless sea of us rising up

茫茫大海上，我们徐徐升起

And the preacher man and the preacher's son

牧师和儿子

Will stand arm in arm just like everyone

手挽手站着，像其他人一样

Me longing to be free I won't let you fade away

我渴望自由，不会让你走开

We shed so many dreams I'll let them fade away

我们放弃了太多梦想，就让它们流逝吧

In the hands of love we carry on

我们携手相爱，勇往直前

Stronger than we started

比开始时更坚强

Be ashamed of the trail behind us

背后的道路让我们感到羞愧

Wicked is the blinded

坏人蒙蔽了双眼

Who we are comes to life yeah

我们苏醒了，耶

Who we are comes to life

我们苏醒了

When the water spills the glass will break

当水溢出时，玻璃也将打碎

It drips like tears running up your face

像泪水般滴落，流过你的脸颊

And the hounds will cry for the dance of war

为了战争之舞，猎犬也将哭泣

But the sons of joy their victory will soar

但是最终的喜悦，能让胜利高涨

Me longing to be free I won't let you fade away

我渴望自由，不会让你走开

We shed so many dreams I'll let them fade away

我们放弃了太多梦想，就让它们流逝吧

In the hands of love we carry on

我们携手相爱，勇往直前

Stronger than we started

比开始时更坚强

Be ashamed of the trail behind us

背后的道路让我们感到羞愧

Wicked is the blinded

坏人蒙蔽了双眼

Who we are comes to life yeah

我们苏醒了，耶

Who we are comes to life

我们苏醒了

Me longing to be free I won't let you fade away

我渴望自由，不会让你走开

In the hands of love we carry on

我们携手相爱，勇往直前

Stronger that we started

比开始时更坚强

Be ashamed of the trail behind us

背后的道路让我们感到羞愧

Wicked is the blinded

坏人蒙蔽了双眼

Who we are comes to life yeah

我们苏醒了，耶

Who we are comes to life

我们苏醒了

We come alive

我们苏醒了

We come alive

我们苏醒了

We come alive

我们苏醒了

We come alive

我们苏醒了

We come to life

我们苏醒了