我儿子在一所中学读二年级时，在一家超级市场找到了一份包装商品的业余工作。
When my son was a high-school sophomore, he got a part-time job — sacking groceries at a supermarket.
我儿子在一所中学读二年级时，在一家超级市场找到了一份包装商品的业余工作。
Part-time Job 'When my son was a hign-school sophomore, he got a part-time job sacking groceries at a supermarket.
介绍以工业余热为热源的单级氨水吸收式制冷机在工业制冰（蓄冷）与冷藏中的应用。
This paper deals with the application of one stage ammonia absorption type refrigerator based on industrial waste heat recovery in industrial ice making (cold storage)and refrigeration.
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