Inferior

作为形容词：（等级，地位等）下等的；下级的；低劣的

作为名词：部下，地位低的人；次品

短语：inferior to 级别低于 ; 次于 ; 不如 ; 优于

inferior in 在…方面低劣

例如：If children were made to feel inferior to other children, their confidence declined.

如果让孩子感觉他们不如其他孩子，他们的信心就会减弱。

The cassettes were of inferior quality.

那些磁带质量较差。

These oranges are inferior to those I bought last week.

这些桔子没我上星期买的好。

The car is inferior in quality.

这辆车质量差。

Costly

作为形容词：昂贵的，代价高的，价值高的

例如：It has been rather costly to install the machinery, but it should pay off in the long run.

安装这套机械代价很高，但从长远来看它会赚钱的。

Some people think tea egg is costly for people from mainland.

有人说茶叶蛋太贵了，大陆人买不起。

Velocity

作为名词：速度，迅速；周转率

短语：the velocity of light 光速

to gain/lose velocity 加 / 减速

例如：The velocity of light is about 300000 kilometres per second.

光速约为每秒300000公里。

Jaguars can move with an astonishing velocity.

美洲豹跑起来速度惊人。