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。
Simple solar dryers, constructed from a wooden frame covered with plastic, let the light in, keep insects out and use natural convection.
在砾石充填作业期间放置的为支承和挡住砂子所用的由金属制成的过滤装置。
A metal filter assembly used to support and retain the sand placed during gravel pack operations.
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