in this version of time travel, the grandfather, he says, is 「a tough guy to kill.」
他说,按照这种模型的时间旅行,时间旅行者的祖父是「一个难杀的家伙」。
if you thought that 「avatar」 was just a high-tech movie about a big-hearted tough guy saving the beguiling natives of a distant moon, you might want to check the prescription on your 3-d glasses.