慢速英语:American Jihadist Killed in Syria

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短语讲解：

1. The State Department said U.S. officials had communicated with his family.

communicate with 与…联系，与…交往; 与…相通
例句：Each was able to communicate with anyone nearby.
每个人可以和旁边的任何人交流。

2. Over the weekend, he took part in an attack near Aleppo against another opposition group, called the Free Syrian Army, NBC News reported.

take part in 参加…，参与…活动
例句：The community members who take part in the study circles.
参与这项研究会一部分工作的社区成员。

3. U.S. officials have recently expressed concern about American citizens who join extremists groups like Islamic State.

concern about 使（自己）关心…
例句：She showed great concern about you. 
她很为你担心。 

4. Doctors at Beijing University removed a small part of Qin’s backbone and replaced it with a 3-D printer copy.

replace with 用…代替
例句：He is pension off and replace with a younger man 
他被迫退休, 由一年轻人接替其职务 

5. The part is made of titanium.

be made of 用…造成（用于原材料显而易见的场合）;
例句：The fishing rod is made of split bamboo. 
这钓鱼竿是用劈开的竹子做的。