を汚染する
recess
CEO
pollute
setback
汚染物質、汚染源
hold back
try out
pollutant
skull
（ごみなどの）投げ捨て、投棄
monarch
worship
dumping
（ごみの）埋め立て（地）
landfill
grind
accomplishment
germ
土壌
soil
slaughter
slam
get in on
有機栽培の
strenuous
lessen
organic
elk
たい肥
compost
organ
aristocrat
tip
肥料
follow up
fertilizer
hold up
scam
殺虫剤
break out
scoop up
pesticide
atmosphere
収穫
break down
janitor
harvest
occupancy
Select the first quiz： Ctrl + Enter
View Explanation：Ctrl + G
Close a feedback：Esc
When selecting a quiz
Answer：Enter
Select a choice：↓ or ↑
Reading out the question：Ctrl + K
View Hint： Ctrl + M
I don't know： Ctrl + Y
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