The formation point-roils were difficult, for through the inverted half Jonathan had to think upside down, reversing the curve of his wing, and reversing it exactly in harmony with his instructor's.

列队定点翻滚是很难学的，因为在倒转时，乔纳森得头朝下、脚朝上倒过身子思考问题，同时还要把翅膀倒弯过来，而且要弯得恰到好处，倒好与他的导师一致。

youdao

Objective : Pterygium formation is the process of the arising and extending of wing-shaped fold of fibrovascular tissue from the interpalpebral conjunctiva to the cornea.

目的：翼状胬肉是指睑裂区的增殖性组织自结膜长至角膜的一系列过程。

youdao

She was piloting an AT-6 "Texan" when the wing of another AT-6 flying in formation colliding with Lovejoy's aircraft, according to Lauria-Blum.

WSJ: NY museum paying tribute to WASP killed in WWII

In a radical experiment which he called "building without foundations", he skipped the concrete substructure and instead built the guest wing on a pre-existing natural rock formation.

BBC: An Alvar Aalto tour of Finland