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心界可向两侧增大，坐位时呈三角形烧瓶样，卧位时心底部浊音界增宽见于
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There are generally two types of packing: sales packing and transportation packing. In this dialogue, for sales packing, the buyer chooses ________ packing from skin packing, hanging packing and blister packing; for transportation packing, the seller advises 100 boxes in a ________ case with overall ________ to protect cargo from ________ and ________.
________ and ________ have been discussed in this dialogue.
Due to heavy ________, it is difficult for the factories to get the goods ready in ________ but possible to deliver _______ in September and the rest in October.
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