Expertise in tennis requires lots of practice; it's hard to improve your swing without spending a lot of time on the court.

成为网球高手需要大量的练习；不在球场上花大量时间练习就很难改进挥拍的技术动作。

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"It's really hard to describe the feeling I have right now," Djokovic said in an on-court interview.

“现在确实很难形容我的感受，”德约科维奇在接受场边采访时说。

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He would court opprobrium if he were to argue that, as a class of human beings, they lack morals or self-control, or to claim that they exist parasitically on the hard work of others.

如果他提出，黑人作为人类的一种，是缺乏道德和自控的，或者说他们寄生于他人的辛劳工作之上，他将遭到责骂。

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(OMITTED) Students work as hard in class as they do on the basketball court, and Taylor says they are succeeding.

VOA: standard.2010.06.24

On Monday,a Sri Lankan court sentenced Tissainayagam to 20 years of hard labor for causing "communal disharmony".

VOA: standard.2009.09.01

"It's not easy to face a player such as Safin on hard-court, " said Gasquet.

BBC: Safin blows out Gasquet

My coach told me before the match to play like I was on a hard court and that's what I did.

BBC: Elena Baltacha beats Sorana Cirstea on Strasbourg clay

When he returns he will be on his favourite hard court surfaces and he understands what he needs to do.

BBC: Wimbledon 2011: Tim Henman on Andy Murray