它们通过细胞壁上非常细小的孔吸进食物和排出废料。
Such cells take food in and let waste out through very small openings in their walls.
在聚酯废料生产三角异形涤纶短纤维过程中对影响纤维截面异形度的主要因素：喷丝孔截面形状、纺丝温度、冷却成形条件、后欠伸工艺参数等进行探讨。
During the process of spinning triangular heteroclite dacron fibres from polyester garbage, there are factors that may affect the hetercliteness of the intersecting surface of the fibres thus spun.
该冲头包括端部，该端部适于刺穿入口孔并折弯环绕该入口孔的材料，以沿着该入口孔的内缘形成残留的废料。
The punch includes an end portion adapted to Pierce an entry hole and bend material around the entry hole to form a retained slug along an inner edge of the entry hole.
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