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。

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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。

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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。

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

卡车撞到了你，你在无痛中立即死亡。

耶鲁公开课 - 死亡课程节选

The opening five minutes of the first round saw Watson run the board quickly and painlessly.

FORBES: On First Night Watson Went From Fearsome to Flummoxed To First

Most animals are killed (painlessly) when the research they are being used for is finished.

ECONOMIST: Animal rights extremists

Yet the notion that motorists can be persuaded painlessly to switch to public transport is bogus.

ECONOMIST: Traffic