一把好设计的刀应比同样好的制作但设计差的刀更有感染力。

A knife of good design will be more appealing than an equally well made knife of poor design.

她的欢笑声非常有感染力。

Her laugh is very contagious.

拉丁舞的节奏非常有感染力。

The rhythm of Latin dance is very infectious.

他的大笑总是那么有感染力。

His laugh is always so contagious.

孩子们的快乐是有感染力的。

The children's gaiety was infectious.

他对未来的希望是有感染力的。

His hopefulness about the future is contagious.

这座城市的活力是有感染力的。

The liveliness of the city is infectious.

她的年轻的活力是有感染力的。

Her youthful energy is contagious.

节日里愉快的气氛是有感染力的。

The jovial atmosphere at the festival was contagious.

这位演讲者的声音非常有感染力。

The orator has a very compelling voice.