However, the heavier unbalanced radial force existed in the traditional two-gear's gear pump is a chief factor to affect the pump's service life.

但是传统的二齿轮式齿轮泵存在较大的不平衡径向力，成为制约齿轮泵寿命的主要因素。

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The SB series concentric pump housings are heavier and stronger to outlast conventional pumps. The housings are thicker for extra strength and extended service life.

与普通泵相比，该砂泵泵体重而结实，经久耐用，因其强度特殊，故壁厚也比一般泵要厚些，寿命也相对较长。

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He says his workload (from 7am to 11pm, he groans) is made heavier by the shortage of DPJ politicians appointed to government posts: atop a civil service of 290, 000, there are just 63 DPJ officials in central-government positions.

ECONOMIST: Tackling Japan's bureaucracy