重点讲解：
1. in total 总共；总计；
In total, the exercise involved 13 countries, six US cabinet-level departments and 60 companies.
这次演习总共有13个国家参与，涉及美国6个内阁部门以及60家公司。
2. pile up （使）堆放；（使）堆积；（使）成堆；
Bulldozers piled up huge mounds of dirt.
推土机推积起大堆大堆的泥土。
3. by hand 用手的；
Rice farmers here still plant and harvest their crops by hand.
这里种植水稻的农场主仍是人工种植和收割庄稼。
4. knock out 摧毁；使瘫痪；
A storm has made roads treacherous and knocked out power.
一场暴风雨致使公路隐患重重且电力瘫痪。
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