1.They killed the harmless old man in cold blood.

1.他们残忍地杀害了那位辜老人。

2.The trouble was sparked off by an apparently harmless phrase.

2.这场麻烦是由一句恶意的话引起的。

3.He certainly seems harmless enough, but is he a wolf in sheep’s clothing?

3.看起来他倒是十分和善，但会不会是披羊皮的狼？

4.This method was at low cost, harmless and suitable for extracting,separating and preparing mesaconitine,aconitine and hypaconitine.

4.方法所用试剂成本低、毒性小,适用于碱、碱、次碱的提取分离以及对照品的制备。

5.The purple pigment which is asbtracted from the Althaea roseal is a harmless natural dystuff.This article introduces the research of the purple pigmenting from the althaea roseal and its stability.

5.从蜀葵花瓣提取的紫色素是一种安全害的天然染料.本文对蜀葵花的紫色素的提取及稳定性的研究作了介绍.