Members of the Japan's Self-Defense Force cleaned up debris on April 11 in an area destroyed a month ago by the tsunami in Natori, Miyagi prefecture, northern Japan. (Vincent Yu/Associated Press)

日本北部宫城县Natori地区，自卫队成员在清理由于3月11日地震和海啸袭击造成的残骸。

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Usually the compressive force is in the form of hammer blows using a power hammer or a press, as shown in Fig. 4.1.

通常压力都是以由如图4.1所示的动力锤或压力机提供的锤击形式出现。

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It can obviously decrease the press of the system in the situation of the output force and the diameter of the hydraulic cylinder is limited.

在输出力及液压缸直径一定的条件下，能显著降低系统的压力。

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After outlining the principles contained in the South African constitution guaranteeing freedom of expression and the restrictive definition of its limits, Thloloe described the system of self-regulation of the press in force in his country.

UNESCO: Communication and Information