We could hear ambulance sirens outside, with the occasional rat-tat-tat of gunfire.
听得外面有救护车的声音，不时地还听到了几声辟雳啪啦的枪响。
2
Donald perches on a nearby tree and aims his beak in the same direction. Rat-a-tat-tat, he calls into the air.
唐纳德落在附近一棵树上，嘴巴指着塔尖的方向，Rat - a - tat - tat(咚——啊——咚——咚)，向着天空高唱起来。
3
But the clinical application of TAT and TIG are limited because anaphylaxis is caused by TAT, blood resource is inadequate, and pathogen contamination is caused by TIG.