排气系统上的接触反应器含有铈和镧。

The catalytic converter on your exhaust system contains cerium and lanthanum.

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目的：探讨微量元素镧与龋病的关系。

Objective: To study the relation between microelement lanthanum and caries.

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并非所有稀土元素都像钪、钇、镧加上14所谓的镧系元素那样稀少。

It is not as though the rare-earth elements-scandium, yttrium and lanthanum plus the 14 so-called lanthanides-are all that rare.

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But what's really shocking is when you compare this with this, it's based upon sonnet 57 because lanthanum is element 57.

但是真正令人震惊的是,当你比较这个和这个的时候，基于诗57来看7,而正好镧是57号元素。

麻省理工公开课 - 固态化学导论课程节选

So, remember when you're looking at your periodic table, don't forget about the lanthanides, sometimes they come into play.

因此，要记住，当你在看元素周期表时，不要忘了镧系元素，有时候也会用到它们。

麻省理工公开课 - 化学原理课程节选

And if you remember this phrase, I don't know why you would, but this will help you learn the lanthanides in order.

如果你能记得这句话的话，我不管你们是怎么做到的，但是这个确实会帮助你按顺序记住镧系元素。

麻省理工公开课 - 固态化学导论课程节选