Production planning refinery optimization model with variable costs

Variable costs increase as production increase.

可变成本则随着产量的增加而增加。

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We wonder that the little boy is a university student.

我们很惊奇这小男孩是大学生。

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The old-time mother who used to wonder where her boy was now has a grandson who wonders where his mother is.

惯常想知道自己的孩子在哪里的旧式母亲，如今有了个想知道自己的母亲在哪里的孙子。

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I wonder if the boy ended up serving in Vietnam.

我想知道这个男孩会不会英勇作战于越南战场。

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I wonder that the boy made such a rapid progress.

我感到十分惊讶，那个男孩进步那么快。

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If you see Wayne Rooney out on the streets make sure you send him straight home? Everton FC coach David Moyes asks the club's fans to help keep wonder boy Wayne Rooney out of trouble.

如果你在街上看到韦恩-鲁尼，请务必送他直接回家&埃弗顿队教练大卫-莫耶斯呼吁埃弗顿球迷帮助天才少年韦恩-鲁尼远离麻烦。

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Let's go find the wonder boy.

我们去找那个神奇的小伙子吧。

provided by jukuu

Remain within reach ( call, hearing, sight)

留在附近（叫得应，听得见，看得到的地方）

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We are still on this path and extraordinary achievement is within reach.

我们正在这些领域继续前进，用不了多久就会取得非凡的成就。

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As this column went to press, a deal looked within reach.

在本专栏文章付印之际，各方看来有望达成共识。

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This will keep fruiting wood within reach of the ground.

这将保持出菇木材到达地面。

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Bringing a higher education within reach.

尽力让所有人得到更好的教育。

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BP says the solution now appears within reach.

BP表示，最终的解决方案即将完成。

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He lives within reach of a city;

他生活在都市里；

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And it will put health care within reach for millions of Americans.

这样，我们才能真正为数亿的美国人提供医疗服务的保障。

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Yet each of the objectives I have described is within reach.

但我所描述的每一项目标，都是可以实现的。

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But in those areas which are within reach of motor vehicles,

但是在那些汽车可以到达的地方

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Another positive: Homes are still within reach of many buyers.

另一项利好是：房价仍在许多购房者的承受范围之内。

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After years of saving, the car was at last within reach.

存了几年钱后，她终于买得起那车了。

provided by jukuu

The work of putting American families'dreams back within reach goes on.

为美国家庭追回可见的美国梦，我们也正在努力。

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