...ned on a case-by-case basis 视具体情况而定 be heat traced/insulated by hot water 热水伴热/保温 be tested on industrial scale 中试 ..
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The bonnet and packing box of low temperature service instrument in-line valves shall be extended bonnet type or heat traced, if necessary, to avoid freezing of valve stems.
低温设备仪表在线阀门的阀帽和填料箱应为加长阀帽型或伴热型(必要时)，从而避免阀杆结冰。
Our ovens can be traced to the Han Dynasty(206 B. C. to A. D. 20). The heating source, natural smoke and heat, is derived from split oak or seasoned wood.
我们的“红炉”烤箱可以远溯到两千多年前的中国汉朝（公元前206-公元20年），其内部热量完全来自于原木及稻草的燃烧与烟熏。
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