This means that the value of a local constant is undefined until the constant declaration statement is reached and that a local variable is undefined until the variable is assigned to in the function.

这就意味着在到达常数声明语句前局部常数值是未定义的，在函数中分配变量前局部变量是未定义的。

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If your page needs the same (constant) information that it got earlier, you can enhance performance by setting up a local cache, as shown in Listing 3.

如果页面需要以前得到过的(不变的)信息，那么可以通过设置本地缓存来提高性能，见清单3。

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Nicknamed "Little Sweetie" after a comic-book character with a similarly beguiling smile and sense of style, her picture was a constant presence in the local papers.

她的绰号“小甜心”来自于一本漫画书，书中人物带有类似的迷人笑容和时尚感。她的照片不断见诸报端。

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While terrorism is a constant threat, local and federal emergency responders in the U.S.

VOA: standard.2010.03.30

Michael Jackson's death led many of Pakistan's local television channels Friday morning, knocking the near constant coverage of the military campaign against Taliban militants off the top of the news lineup, if only for a few hours.

VOA: standard.2009.06.26

Audi claims the A8 Hybrid will be able to run at speeds up to 62 mph solely on electric power, and will produce zero local emissions at a constant speed of 37 mph.

FORBES: Sneak Preview: Audi A8 Hybrid

Or how about the experiment suggested by Sir Peter Newsam, a former head of London University's Institute of Education, for initiative-free zones, where head teachers are left to run schools without constant meddling from local authorities and ministers?

ECONOMIST: Schools

But a suffocating legacy of local political scandal supplies the most constant campaign theme.

ECONOMIST: Everybody suddenly wants to clean up New Jersey