Part per trillion是什么意思？

• algiers
• searches
• lycopene
• 造型的英文
• 参数英文
• conflict
• passage
• satisfaction
• 缺陷英文
• silver
• emergency
• rice
• 局外人英文
• toxicity
• 抛弃英文
• front
• explore
• repeat
• PAXLOVID怎么读
• 确认英文
• lake
• prompt
• tourist
• autumn
• general
• permitted
• dragon
• 来源英语
• fiercely
• droplets

• reveal
• 分配英文
• erased
• passage
• pear
• profile
• maths
• disappointed
• bombarded
• 领域英语
• narrow
• 导师英文
• 参与者英文
• general
• searches
• begins
• organizations
• panicked
• lesson
• failure
• ticket
• monitor
• 流浪者英文
• juice
• vehicle
• modernize
• 实施英文
• peeping
• BARRIE
• ultra

• menstrual period
• blame oneself
• stink of
• piumbeous
• in progress
• tinplate
• Graeco
• subpena
• copper froth
• reeved
• yoghourt
• rack post
• Uygur
• hemivertebrae
• avena sativa
• say with certainty
• down gate
• imidazole
• buy over
• chopped wave
• ride horseback
• outlet end
• short for Europe