Their gaieties were overshadowed by the sad news.是什么意思？

Their gaieties were overshadowed by the sad news.

这不幸的消息使他们的欢乐蒙上一层阴影.

their

pron. 他（她，它）们的，在提及性别不详的人时，用以代替 him 或 her；

例句
Their permissiveness toward their children reflects the wild abandon of their own lives.
他们对孩子的放任折射出他们自身生活的放浪形骸。

gaieties

n. 快乐( gaiety的名词复数 )，高兴，作乐，花哨；

例句
Their gaieties were overshadowed by the sad news.
这不幸的消息使他们的欢乐蒙上一层阴影.

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

overshadowed

v. 使（某物）被遮暗( overshadow的过去式和过去分词 )，使阴暗，使（某事物）令人不快或减少乐趣，使（某人）相形见绌或黯然失色；

例句
His triumph was overshadowed by an uneasy sense of foreboding.
他的胜利因为一种令人不安的不祥预感蒙上了阴影。

by

prep. 在…旁边，表示方式，由于，经过；adv. 经过，表示保留或保存时用，短暂拜访；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

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。

sad

adj. 悲哀的，糟糕的，可悲的，令人遗憾的；

例句
It was sad that his international career should end in such anticlimax.
令人悲哀的是，他的国际职业生涯竟如此惨淡收场。

news

n. 新闻，消息，（可当作新闻内容的）人，物；

例句
If nature abhors a vacuum, journalists abhor a transition, when there is little news to cover.
好比自然界拒绝真空一样，新闻工作者则厌恶没有多少新闻可供报道的过渡时期。