With more and more research available, knowledge on the effects of bismuth begins to change from a deleterious impurity which people tried their best to remove to a beneficial dopant.
随着研究的不断深入，对铋的作用的认识已有所变化，已经从多年前人们一直想方设法除去的有害杂质变成了有益杂质。
With more and more research available, knowledge on the effects of bismuth begins to change from a deleterious impurity which people tried their best to remove to a beneficial dopant.
随着研究的不断深入，对铋的作用的认识已有所变化，已经从多年前人们一直想方设法除去的有害杂质变成了有益杂质。
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