perforation词根词缀

perforation

[ˌpɜ:fəˈreɪʃn]

n.穿孔;贯穿;针孔;齿孔;

复数： perforations

例句:

1、

Results show that the acoustic system of micro perforation plate can effectively reduce discharge noise.

试验表明,微穿孔板吸声结构可有效地降低排气噪声.

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2、

The relationships among perforation diameter , density, phase and casing strength are clarified.

明确了射孔直径 、 度及相位等与套管强度的关系.

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3、

It is known that ear drum perforation resulting from burns resists closure.

摘要我们都知道,经过烧烫伤而穿孔的鼓膜,不易愈合.

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