双襟 meaning in Chinese

d.b. double-breasted
double breasted
double-breasted

Study on some breakdown forms and characteristics of leading edge vortex over delta wings
三角翼的双襟翼控涡作用的数值模拟研究
Single double breast
单双襟
A single flap replaces the previous double design and the additional winglets over the main profile have increased in length , almost reaching the side of the nosecone
单襟翼取代了原本双襟翼的设计，同时主体上方额外的翼端帆长度也增加，现在几乎要碰到鼻锥。