The artificial leaf is a thin sheet of semiconducting silicon - the material most solar cells are made of - which turns the energy of sunlight into a flow of wireless electricity within the sheet.
人造叶子主要是一层很薄的半导体硅板，能够将太阳光转化为硅板内的无线电流，硅也是大部分太阳能电池的主要材料。
This is called laminar flow because of the concept of one lamination or thin cylindrical sheet of liquid flowing inside another. Other names for this type flow are streamline and viscous flow.
因为液体的薄圆筒层在另一个圆筒内流动，这种流动称为层流或线状流动或粘性流动。
If the sheet is relatively thin, the range of welding parameters obtained that can get better weld quality is wider. Heavily plastic flow of the weld metal occurs inside the weld during the process.
板材厚度较小时，形成良好焊缝的规范参数范围较宽，焊接过程中接头内部发生了剧烈的塑性流动。
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