Whether these exalted personages were themselves professional metallurgists we do not know, but we may at least surmise that the details of metallurgical practice, being of extreme importance to the Crown, were carefully guarded from the vulgar.

• 我们不知道这些高贵人他们自己是否就是职业冶金家，但是我们至少可以猜测冶金学实践的详细资料，实践对王冠极端重要，仔细防范着平民。