第三层底 third bottom
三层结构喷嘴底喷优势 The Advantage of Under-Bed Spray
三层钢厚底蒸锅 three layer steel thick bottom steamer
前院的地面有高低三层，中间一层有条小道延伸出去，中间一层和地面最底那层之间有道石墙。
The front yard was terraced on three levels with a sidewalk down the middle and a rock wall between the middle and ground levels.
三层复合底，受热均匀。
三层真空复合底，比普通焊接复合底更耐用，煤气炉等明火炉灶使用；
III. Tri-ply vacuum base, more stronger and efficient heat conduction, can use on gas or electric ranges;
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