He heard the sharp crack of a twig.他听到树枝清脆的断裂声。He shifted his weight and a twig snapped.他挪了一下身体的重心，一根树枝咔嚓一声断了。The other end of the twig is sharpened into a sharp point to use as a toothpick.细枝的另一端被削尖用作牙签。Current twig and...
他们中的许多人置一己私利于集体利益之上。Many of them placed self-interest before the common good.他做事完全出于私利。He is motivated entirely by self-interest.她完全是出于私利。She was motivated solely by self-interest....