used to refer to someone or something that is very difficult to lift or move, due to being heavy
used to refer to someone or something that is very easy to lift and carry, due to having no considerable weight
snail mail
[名词]
mail that is delivered physically by the postal system as opposed to email and other electronic means

传统邮递, 慢速邮件
Ex: If you need to send something urgentlysnail mail is not the best option .
crystal clear
[形容词]
(of an object) clear or thin enough for one to be able to see through it

晶莹剔透的, 清澈透明的
used to refer to a place that is completely silent or quiet, with no noise or sound at all
used of someone or something that is seen or considered very normal in America
in alignment with a specific path, course, or set of guidelines within a given context or framework

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