1、speculation

推測;猜測;猜想

Critics of the project speculate about how many hospitals could be built instead.

對該項目持批評態度的人在推測如果改作他用不知可以建多少所醫院。

It would be unfair to Debby's family to speculate on the reasons for her suicide.

猜測黛比自殺的原因對她的家人來說是不公平的。

投機;做投機買賣

Big farmers are moving in, not in order to farm, but in order to speculate with rising land prices.

大農場主正在不斷涌進來，不是為了耕作，而是要利用不斷上漲的地價進行投機。

The banks made too many risky loans which now can't be repaid, and they speculated in property whose value has now dropped.

各銀行貸出去太多高風險貸款，目前無法收回，他們還進行地產投機，而地產的價值目前已經下跌了。

2、common

常見的;普遍的

His name was Hansen, a common name in Norway.

他的名字叫漢森，在挪威是一個常見的名字。

Oil pollution is the commonest cause of death for seabirds.

石油污染是造成海鳥死亡最常見的原因。

共有的;共同的

Moldavians and Romanians share a common language.

摩爾達維亞人和羅馬尼亞人使用同一種語言。

Such behaviour is common to all young people.

這種行為在年輕人中司空見慣。