Coal and coal products are also potential sources of rare earth elements. Rare earth elements are a group of elements that most people don't understand (shown in purple in the periodic table below). They include lanthanide elements (CE to L), yttrium and scandium. Although rare elements are very important in our modern technology world, they are quite rare because they are used in various products that people use everyday, including TV sets and mobile phones.

煤炭和煤炭制品也是稀土元素的潛在來(lái)源。稀土元素是大多數(shù)人所不了解的一組元素（在下面的元素周期表中以紫色顯示）。它們包括鑭系元素（鈰到l），釔和鈧。雖然稀有元素在我們的現(xiàn)代技術(shù)世界中非常重要，但因?yàn)樗鼈儽挥糜谌藗內(nèi)粘Ｊ褂玫母鞣N產(chǎn)品，包括電視機(jī)和手機(jī)，所以稀土元素相當(dāng)罕見(jiàn)。