"有时候，在提炼的过程中会出现这些情况：一个气泡没有被移除，一个砂粒没有熔化，（熔融的）锡的一次颤动把波纹带进了玻璃带中。
Occasionally, a bubble is not removed during refining, a sand grain refuses to melt, a tremor in the tin puts ripples into the glass ribbon.
所以，提倡孩子们实际观察、亲自动手有着至关重要的意义，就像当年锡德带我们做的那些事一样。
So it would be a crucial thing to improve the value of the practical work that children do, the sort of work we did with Sid.
大兴安岭中南段古生代锡多金属成矿省，在克拉通北缘早晚古生代增生带的张裂型沉积盆地内分别生成各具特征的铅锌锡多金属矿床。
Paleozoic Sn polymetallic province in the northern accretionary zones of the craton, where Pb Zn and Sn polymetallic deposits were formed in Paleozoic basins with extensional tectonic background.
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