1、speculation

推测;猜测;猜想

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

对该项目持批评态度的人在推测如果改作他用不知可以建多少所医院。

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

猜测黛比自杀的原因对她的家人来说是不公平的。

投机;做投机买卖

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

大农场主正在不断涌进来，不是为了耕作，而是要利用不断上涨的地价进行投机。

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

各银行贷出去太多高风险贷款，目前无法收回，他们还进行地产投机，而地产的价值目前已经下跌了。

2、common

常见的;普遍的

His name was Hansen, a common name in Norway.

他的名字叫汉森，在挪威是一个常见的名字。

Oil pollution is the commonest cause of death for seabirds.

石油污染是造成海鸟死亡最常见的原因。

共有的;共同的

Moldavians and Romanians share a common language.

摩尔达维亚人和罗马尼亚人使用同一种语言。

Such behaviour is common to all young people.

这种行为在年轻人中司空见惯。