Nitrogen Protection is used in practical industry because of poor wettability of lead-free solder.

由于无铅钎料润湿性较差，在实际生产中普遍采用氮气保护。

youdao

Specially including nitrogen chamber to evaluate the effect of nitrogen protection on solderability.

特别配有氮气保护腔，用于评价氮气保护条件对可焊性的影响。

youdao

Nitrogen protection: Apply nitrogen to detect the oxygen amount contained in the machine online ensuring the safe operation.

氮气保护系统：采用氮气保护以保证机器在安全的环境下运行。

youdao

The national temperament is changing with the U.S. Congress enacting tougher rules on sulfur dioxide, nitrogen oxide and mercury while the U.S. Environmental Protection Agency is beginning to clamp down on greenhouse gases.

FORBES: A Wounded Coal Industry Seeks To Unseat A Rockefeller Who Turned On Them

For years green groups have been trying to persuade the Environmental Protection Agency (EPA) to set a limit for the amount of nitrogen and phosphorus allowed in the states whose rivers feed the Mississippi.

ECONOMIST: Nutrient pollution

The Environmental Protection Agency (EPA) estimates idling trucks consume nearly one gallon of fuel per hour, while emitting nitrogen oxides and particulates, which contribute to smog.

CNN: An eco-friendly way to cool big trucks