What hits the ball? Quickly, answer. It's not the racket, it's the racket's face, or strings. Keep this in mind.

什么击打球? 快， 马上回答。 不是球拍， 而是拍面， 或者说球线。 记住这点。

youdao

Nathan: ah, I said: racket technology and strings have advanced to the 21st Century.

慧慧：有关球拍的技术和球拍的弦都在21世纪有了很大的改观？

youdao

Nathan: : ah, I said: racket technology and strings have advanced to the 21st Century.

慧慧：有关球拍的技术和球拍的弦都在21世纪有了很大的改观？

youdao

No great tonnage of steel here: Its curving roof is a tensioned cable-net that resembles the strings of a tennis racket.

WSJ: London Olympics 2012 | These Knock-Down, Shrinkable Games | By Hugh Pearman

Some pros and coaches say modern, deadened strings increase the stress on a player's arm if strung too tightly, bringing more shock through the strings, up the racket and into the body.

WSJ: Roger Federer: With Tennis Rackets, He Strings Them Loose

She says she can play with any racket and likes to use one for an entire match, unlike most players, who routinely grab frames with fresh strings.

WSJ: Agnieszka Radwanska: The Subtlest Player at Wimbledon