慢速英语:US Military Facing Threats from Terrorists, Countries

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短语讲解：

1. The United States military says it must prepare to deal with two different threats at the same time.

at  the same time 同时; 一起; 但是
例句：There will be another cause for rejoicing at the same time.
似乎可能还要双喜临门。

2. Defense Secretary Carter says the U.S. military must be able to deal with challenges in more than one area.

be able to 能够
例句：We must be able to stay impartial at all times.
我们必须经常保持公正的态度。

3. He says the country needs a military that is not only big enough but has enough equipment and well-trained troops.

not only...but(also) 不但…而且…
例句：These not only help in presentation but also help orient users.
这不仅有助于表达，而且可以帮助使用者在创建时更好地定位。