胸部 きょうぶ だい動脈 どうみゃくだったら
kyōbudaidōmyakudattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of 胸部大動脈

1. If/when [it] were the thoracic aorta:; If/when [it] were a large vessel in the chest:

Tara Conditional
Anatomy