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。
If you cut back gradually, your taste buds will adapt painlessly.如果你逐渐减量,那么你的味蕾就不会难以适应。