Perminvar
[计] 镍铁钴合金
🗣️ 情景例句
Would a professional photographer be without a picture?
一位专业摄影师会没有照片吗？
The packing must be strong enough to withstand rough handing.
包装必须很坚固，能承受野蛮装卸。
suggested an idea on which he had been working for many years to the British Government and industrial circles.
他向英国政府和工业界提出了他研究多年的一项计划。