H-d
abbr. heavy-duty 關稅重的; 重型的; high-density 高密度; 大密度
??? 情景例句
young and old.
不管是年輕的， 還是年老的。
What are you thinking of?
你正在想什么？
Mr. Smith knew Jack didn't look at the others because he was nervous.
史密斯先生知道杰克不敢看別人是因為緊張。