Ppm.
[医] 兆比率(百万分之几)
🗣️ 情景例句
The government announced its new economic policies.
政府发布了新的经济政策。
Cindy's sister will arrive in eight days.
辛迪的姐姐八天后将到。
in actuality waves move through the water leaving the water about where it was.
而实际上，浪从水中移过，而水则留在原处。