Simple solar dryers, constructed from a wooden frame covered with plastic, let the light in, keep insects out and use natural convection.

这种简单的太阳能干燥装置是用一种覆盖了塑料膜的木架制成的，能够让阳光进入但是挡住了昆虫，而且还利用了自然对流。

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A compact metal locker holds a 2x2x2 meter cube with a lightweight plastic bubble skin, which is configured upon a drop-down aluminum frame.

简洁的金属柜装着由套在下拉式铝框上的轻型塑料泡沫皮形成的2x2x 2米的立方体。

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A hoop house is basically a metal frame covered with plastic or other all-weather material.

一个温室大棚的基础是金属框架，用塑料或者其他全天候材料覆盖。

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A hoop house is basically a metal frame covered with plastic or other all-weather material.

VOA: special.2009.12.22

The frame is no longer assembled from laser-etched wood, instead there's a powder-coated steel frame with PVC plastic sides to help shield the various moving parts and lend an air of professionalism to the affair.

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For example, the car's half-century-old design concept a lightweight space-frame chassis with a plastic composite body has at last found the materials and precision construction techniques necessary to make it reasonably buildable.

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Competitors shoot from the prone position at a paper or plastic target on a wooden frame, with a round, black aiming mark on a white background.

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