她們解開了馬尾。

They untied their ponytails.

Source: Tatoeba

Sentence Composition

1 她們 tāmen they; them (females)
2 解開 jiěkāi
  1. to untie
  2. to undo
  3. to solve (a mystery)
=3 了 le
  1. (completed action marker)
  2. (modal particle indicating change of state, situation now)
  3. (modal particle intensifying preceding clause)
=3 了 liǎo
  1. to finish
  2. (used with 得 dé or 不 bù after a verb to express (im)possibility, as in 忘不了 wàngbuliǎo "cannot forget")
  3. (literary) (usually followed by a negative such as 无 wú or 不 bù) completely (not); entirely (not); (not) in the least
  4. to understand clearly (variant of 了 liǎo)
=3 了 liǎo
  1. (of eyes) bright
  2. clear-sighted
  3. to understand clearly
=3 了 liào unofficial variant of 瞭 liào
=4 馬尾 Mǎwěi see 马尾区 Mǎwěi Qū
=4 馬尾 mǎwěi
  1. ponytail (hairstyle)
  2. horse's tail
  3. slender fibers like horse's tail (applies to various plants)