英语语法分析

A new influenza vaccine, administered painlessly in a nasal spray, is effective for children.

一种新的流感疫苗以无痛的鼻喷剂接种，对儿童有效。

Tears can be obtained painlessly without invading the body and only tiny amounts are needed to perform highly refined analyses.

人们可以轻松地获取眼泪，不会对身体造成伤害，而且只需要微量的眼泪就可以进行高度精细的分析。

The truck hits you,you die,painlessly and immediately.

卡车撞到了你，你在无痛中立即死亡。