I was born with a congenital amputation so it basically means my arms end at the elbows, my legs end at the knees.
我出生时就是先天性断肢，因此基本上我的手最长到肘部，而我的腿最长到膝盖处。
英语百科
Congenital amputation
Congenital amputation is birth without a limb or limbs, or without a part of a limb or limbs.
It is known to be caused by blood clots forming in the fetus while in utero (vascular insult) and from amniotic band syndrome: fibrous bands of the amnion that constrict foetal limbs to such an extent that they fail to form or actually fall off due to missing blood supply. Congenital amputation can also occur due to maternal exposure to teratogens during pregnancy.