科学家们认为巨齿鲨是地球上存在过的最大的掠食性鱼类之一。

Scientists believe ___megalodons were among the largest predatory fish ever to exist on Earth.

这座新建的购物中心简直就是零售业的巨无霸，让周围商店相形见绌。

The new shopping mall is a ___megalodon in retail industry, making nearby stores look tiny.