然而，对于翼龙来说，产生这样的海浪的风可能过于强大，一旦在空中飞行，它们就无法控制自己的飞行。

The wind that made such waves however, might have been too strong for the pterosaurs to control their flight once airborne.

youdao

麦地那龙线虫病是即将被消灭的第二种疾病(第一种疾病是天花)，人们一旦饮用了受污染的水后就会引发这种疾病。

Dracunculiasis is the second disease which is approaching eradication (the first being smallpox) and it occurs only after people drink contaminated water.

youdao

眼睛一旦画上去了，龙就飞走了。

With the eyes painted on, the dragons would fly away.

youdao