tā / men / sān / gè / rén / xiàn / rù / sān / jiǎo / liàn / hòu / bǐ / cǐ / de / guān / xì / biàn / de / hěn / jǐn / zhāng

他们三个人陷入三角恋后，彼此的关系变得很紧张。

After the three of them became involved in a love triangle, their relationships grew very tense.