Cobalt is a metallic element, atomic number 27 in the period table.

钴是金属元素，原子序数是27。

It identified several different metallic elements, including iron, nickel, magnesium and aluminum.

它鉴定不同的金属元素，包括铁、镍、镁和铝。

Silver is one of the few metallic elements that occurs naturally as the metal in nature.

银是自然界中少数以金属形态天然存在的金属元素之一。

Following renovation work during the 20th Century, certain metallic elements were removed from the famous French landmark and have been carefully preserved ever since.

经过20世纪的翻新工程，某些金属元素被从这个著名的法国地标上移除，并被小心翼翼地保存了。

No substance has perhaps been as constant an ally to insidious scheming as arsenic, the so-called " king of poisons." It's a naturally occurring, widely distributed metallic element.

或许没有任何物质能像砒霜那样，始终是阴谋诡计的忠实伙伴，砒霜即所谓的“毒药之王”。它是一自然存在、分布广泛的金属元素。在化学纯态，它并不构成太大威胁，因为我们的身体对其吸收不佳；但当砒霜与其他元素结合时，危险便随之而。