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1.human speech 人类语言
例句：Birdsong may have more in common with human speech than we realize.
鸟类唱歌和人类的语言之间很可能有我们所意想不到的共同之处.
2.try to 设法
例句：I try to remember all the good times I've had here.
我试着回忆在这里度过的所有美好时光。
3.listen to 听…(讲话)
例句：The students are listening to their teacher in class.
学生们正在课堂上听老师讲课。
4.sit down 坐下
例句：Teachers staged a sit-down protest in front of the president's office.
老师们在校长办公室门前举行了一场静坐抗议。
