a sea of的用法归纳
a sea of含义大量、茫茫一片、无穷的；可用作形容词，接可数名词和不可数名词，比如A Sea Of People(人山人海)。
The square was a sea of people.
广场上人山人海。
Before his eyes was a sea of jubilant people.
他眼前是一片欢腾的人海。
Heavy debts made him fall into a sea of worries.
债台高筑让他陷入愁城。
A sea of flowers; waves of song.
花如海，歌如潮。
The battlefield became a sea of flames.
阵地上成了一片火海。
Can you imagine a sea of sand three times bigger than India?
你能想象一片比印度大三倍的沙海吗?