2 sentences for 打结 (dǎ​jié)

1. 他熟练地将绳子的两头打结在一起。

   tā shú​liàn de jiāng shéng​zi de liǎng tóu dǎ​jié zài​yī​qǐ.

   He skillfully tied the two ends of the rope into a knot.

   Source: Dong Chinese Dictionary

2. 洗完头后，如果不及时梳理，长发很容易打结。

   xǐ wán tóu hòu, rú​guǒ bù jí​shí shū​lǐ, cháng​fà hěn róng​yì dǎ​jié.

   After washing your hair, if you don't comb it promptly, long hair can easily get tangled.

   Source: Dong Chinese Dictionary