( ( At ( our ( flying sites ) ) ) ( , ( it ( ( ( needs ( a ( good ( , ( straight-on breeze ) ) ) ) ) ( to ( stay aloft ) ) ) . ) ) ) )
(ROOT (S (PP (IN At) (NP (PRP$ our) (VBG flying) (NNS sites))) (, ,) (NP (PRP it)) (VP (VBZ needs) (NP (DT a) (JJ good) (, ,) (JJ straight-on) (NN breeze)) (S (VP (TO to) (VP (VB stay) (ADVP (RB aloft)))))) (. .)))
At our flying sites, it needs a good, straight-on breeze to stay aloft.
(ROOT (S (NP (NNP Birds)) (VP (VBP need) (NP (DT a) (JJ light-weight) (NN body)) (PP (IN for)) (S (VP (TO to) (VP (VB stay) (ADVP (RB aloft)))))) (. .)))