zài / yuán sù / zhōu qī biǎo / zhōng / zhǔ zú / yuán sù / bāo kuò / jiǎn jīn shǔ / hé / lǔ sù

在元素周期表中，主族元素包括碱金属和卤素。

In the periodic table, the main-group elements include alkali metals and halogens.