Beat本身就是动词,beating是动词进行时,你用错了,你可以改成her heartbeat was very fast 或者her heart was bearing very fast.这种短句最好不要用分号,要避免chinglish可以改成：maybe her heartbeat was very fast when I was taking photos of her cuz she's (so )shy. Beat本身就是动词,beating是动词进行时,你用错了,你可以改成her heartbeat was very fast 或者her heart was bearing very fast.这种短句最好不要用分号,要避免chinglish可以改成：maybe her heartbeat was very fast when I was taking photos of her cuz she's (so )shy.