Part per billion是什么意思？

• sweater
• front
• 造型的英文
• prompt
• narrow
• general
• vehicle
• passage
• 领域英语
• 实施英文
• neck
• searches
• 局外人英文
• text
• amazing
• tomato
• supper
• begins
• 确认英文
• 呼吁英语
• various
• bombarded
• silver
• banger
• scared
• firmness
• lycopene
• mind
• fake
• pear

• 队长的英文
• searches
• PAXLOVID怎么读
• panicked
• 抛弃英文
• algiers
• brat
• monitor
• disappointed
• lake
• maths
• dragon
• autumn
• 旋律的英文
• peeping
• predict
• 解决方案英文
• repeat
• organizations
• satisfaction
• juice
• 流浪者英文
• profile
• volume
• droplets
• 权限英文
• PEGGING
• 导师英文
• 来源英语
• explore

• take in
• take into account
• take it easy
• take off
• take office
• take out
• take over
• take part
• take part in
• take place
• take stock
• take the field
• take to
• take to heart
• take up
• talk over
• tear apart
• tear down
• tend to
• thanks to
• the other day
• the other way around
• the United States
• think about
• think of
• through and through
• throw out
• throw up
• tighten up
• time lag