volatile是一个特征修饰符（type specifier）.volatile的作用是作为指令关键字，确保本条指令不会因编译器的优化而省略，且要求每次直接读值。 volatile的变量是说这变量可能会被意想不到地改变，这样，编译器就不会去假设这个变量的值了。
volatile
- adj. 易变的，动荡不定的，反复无常的；（情绪）易变的，易怒的，突然发作的；（液体或固体）易挥发的，易气化的；（计算机内存）易失的
- n. 挥发物；<罕>有翅的动物
- 【名】 （Volatile）（意）沃拉蒂莱（人名）
英英释义
volatile
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n.
a volatile substance; a substance that changes readily from solid or liquid to a vapor
"it was heated to evaporate the volatiles"
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adj.
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evaporating readily at normal temperatures and pressures
"volatile oils"; "volatile solvents"
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liable to lead to sudden change or violence
"a volatile situation with troops and rioters eager for a confrontation"
同义词： explosive
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marked by erratic changeableness in affections or attachments
"a flirt's volatile affections"
同义词： fickle
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tending to vary often or widely
"volatile stocks"; "volatile emotions"
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evaporating readily at normal temperatures and pressures
以上来源于: WordNet
柯林斯英汉双解大词典
volatile /ˈvɒləˌtaɪl/ CET6+ TEM8
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1.
ADJ A situation that is volatile is likely to change suddenly and unexpectedly. 变化无常的
例：There have been riots before and the situation is volatile.
先前一直就有暴乱，局势变化无常。
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2.
ADJ If someone is volatile, their mood often changes quickly. 情绪不稳定的
例：He accompanied the volatile actress to Hollywood the following year.
他次年陪那个情绪反复无常的女演员去了好莱坞。
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3.
ADJ A volatile liquid or substance is one that will quickly change into a gas. 易挥发的 [技术]
例：The blast occurred when volatile chemicals exploded.
冲击波是在易挥发的化学品爆炸时产生的。
双语例句原声例句权威例句
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Petrol is a volatile substance.
汽油是挥发性物质。
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The blast occurred when volatile chemicals exploded.
冲击波是在易挥发的化学品爆炸时产生的。
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It is like the sense of chill that follows immersion of the hand in a volatile liquid.
这很像把手浸入挥发性液体后的那种凉飕飕的感觉。
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Volatile markets can react suddenly in wild and unpredictable ways.
VOA: special.2011.08.12
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The longing heart accumulates desires that become in time a kind of volatile waste, which can't be contained.
渴望的心聚集欲望,假以时日便成了,会挥发不能抑制的废物。
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And then he says the tetrachloride will be volatile, 9 and it will have a density of 1.9.
他说四氯化物具有不稳定性，密度是1。
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