soft drug
US /ˌsɑft ˈdrʌɡ/
UK /ˌsɑft ˈdrʌɡ/

1.
軟性毒品
a drug considered to be not harmful and not habit-forming, such as cannabis
:
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Cannabis is often classified as a soft drug.
大麻常被歸類為軟性毒品。
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The debate over legalizing soft drugs continues in many countries.
許多國家仍在爭論軟性毒品合法化的問題。