杀人于无形

杀人于无形 的毒药

(是无色无味) ── Previous context

“A poison that kills without a trace.”

又能 杀人于无形

(- 娘子想要优雅的？ - 对 又优雅 又凄美) ── Previous context

“and killing without a trace.”

又怎么 杀人于无形 啊？

(若是声名鹊起) ── Previous context

“how could it kill without a trace?”