を汚染する
CEO
recess
pollute
setback
汚染物質、汚染源
try out
hold back
skull
pollutant
（ごみなどの）投げ捨て、投棄
dumping
worship
monarch
（ごみの）埋め立て（地）
germ
accomplishment
landfill
grind
土壌
get in on
soil
slaughter
slam
有機栽培の
strenuous
organic
lessen
elk
たい肥
organ
tip
compost
aristocrat
肥料
hold up
follow up
scam
fertilizer
殺虫剤
pesticide
atmosphere
break out
scoop up
収穫
break down
harvest
janitor
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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