Part per billion是什么意思？

• emergency
• lesson
• rice
• banger
• crayon
• text
• peeping
• 权限英文
• failure
• 抛弃英文
• fake
• brat
• aspect
• 参数英文
• supper
• ticket
• conflict
• 解决方案英文
• modernize
• volume
• begins
• committing
• panicked
• giraffe
• explore
• dragon
• 方案英语
• front
• PEGGING
• 来源英语

• 呼吁英语
• monitor
• profile
• tomato
• satisfaction
• tourist
• 领域英语
• vehicle
• candy
• client
• narrow
• default
• pear
• 纪念品英语
• droplets
• 造型的英文
• silver
• scared
• reveal
• permitted
• general
• sweater
• fiercely
• cheese
• 旋律的英文
• approaches
• cloud
• 实施英文
• bombarded
• passage

• The Color Purple
• gagy
• articles of tribute
• swob
• prince of the blood
• swabber
• Or frost
• in pup
• occlusio
• Switchcraft
• call away
• grope for
• siphon off
• with young
• Before Born
• be pregnant
• burrow into
• filling fork
• simply equipped
• wait in hope
• be with child