do pioneering work是什么意思？

• pear
• ticket
• committing
• polite
• 解决方案英文
• 旋律的英文
• saturday
• front
• intermission
• repeat
• dragon
• passage
• profile
• supper
• banger
• begins
• mind
• 领域英语
• predict
• 确认英文
• organizations
• brat
• candy
• BARRIE
• vehicle
• panicked
• explore
• satisfaction
• 来源英语
• firmness

• fiercely
• erased
• reveal
• tourist
• 造型的英文
• maths
• prompt
• client
• peeping
• rice
• cheese
• narrow
• lycopene
• autumn
• lake
• 纪念品英语
• PEGGING
• chess翻译
• failure
• searches
• droplets
• general
• juice
• crayon
• ultra
• amazing
• 导师英文
• permitted
• aspect
• 参数英文

• ethylene
• ethyleneamine
• ethyleneimine
• ethyleneoxy
• ethylenes
• ethylenimine
• ethylephedrine
• ethylestrenol
• ethylethanolamine
• ethylether
• ethylethylene
• ethylhexanal
• ethylhexanol
• ethylhexoate
• ethylhexyl
• ethylhydrocupreine
• ethylhydroxylamine
• ethylidene
• ethylidine
• ethylidyne
• ethyliminum
• ethylin
• ethylism
• ethylisobutrazine
• ethylize
• ethylizer
• ethylmethylcellulose