Apertures

例句:

• The front end of this cylindrical shield is provided with a diaphragm or bulkhead in which are apertures which may be opened or closed at will. 佚名. 神奇的知识之书.
• In this the spindles, arranged vertically in the frame, are driven by bands from a central cylinder, and project through apertures in a horizontal bar. 威廉·亨利·杜利特. 世纪发明.
• He found that fire-damp explodes only at high temperature, and that the flame of this explosive mi xture will not pass through small apertures. 李贝. 西洋科学史.
• The mixture flows through the apertures in the partition, and occupies the lower part of the generator. 弗雷德里克·科利尔·贝克维尔. 伟大的事实.
• And as these parts are used on separate occasions, the respective apertures are opened or closed by a sliding bottom and by a single movement of the hand. 威廉·亨利·杜利特. 世纪发明.

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