短语讲解：

1. It was shared and liked thousands of times.

thousands of 数千的
例句：A computer consists of thousands of components.
电脑由成千上万个部件组成。

2. They participated in a moment of silence and also sang "God Bless America."

participated in 分担，参加
例句：No professionals participated in the contest.
没有职业选手参加这一比赛。

3. Many people used Twitter and Facebook to complain about a small mattress store in Texas that made a commercial related to September 11.

complain about 抱怨，投诉
例句：I can't understand why folks complain about false teeth.
我就不明白，人们为什么老是抱怨假牙的问题。

4. The video featured a woman standing in front of two stacks of twin-sized mattresses.

in front of 面前; 在…前面; 当着…的面
例句：I stood for a few moments in front of the nearest shop window.
我在最近的一家商店的橱窗前站了一会儿。


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