Still,she says the price of robotic milking systems will continue to limit their use.

VOA: special.2009.05.12

Is there a limit to the type of calculator one can use during the test?

我们能在测试中使用的计算器,有没有什么限制？

麻省理工公开课 - 固态化学导论课程节选

So v of t, v is the limit, and we use the symbol dx/dt for velocity.

点的速度等于一个极限,我们用符号dx/dt表示速度

耶鲁公开课 - 基础物理课程节选

And without a vaccine, Dr.Fauci says the best methods of prevention are these: encourage people to limit the numbers of sexual partners encourage men to use condoms train more doctors to perform adult male circumcision empower women to choose their sex partners and protect themselves from getting the virus that causes AIDS All of these goals still remain major challenges.

VOA: standard.2010.07.17