The SOA ontology defines a composition as a subclass of a system, thus emphasizing that while a composition is a system, a system is not necessary a composition.
SOA本体将组合定义为系统的子类，所以，它强调：组合是一个系统，而系统不一定是组合。
I may look like a tenderfoot, but I think I can follow a trail or carry a pack if necessary.
我也许看起来像个新手，不过有必要的话我认为我也能跟着上路或扛包。
It's a necessary condition for many worthwhile things: child care, friendships, etc.
对于许多有价值的事情而言，如儿童看护和友谊等，它是必要的条件。
After several generations of population growth, people packed the landscape in densities so high that communal pueblos may have been a necessary outcome.
经过几代人的人口增长，人们以如此高的密度挤满了这个地区，以至于公共聚居地的出现可能是一个必要的结果。
Some people praised the university for requiring a necessary skill that can save lives, and they also believed that the rule would help improve students' health.
一些人称赞学校要求学生掌握一项必要的技能，可以挽救生命，他们也相信这项规定将有助于改善学生的健康。
At the very least, it has awoken us from our national fever dream of easy riches and bigger houses, and put a necessary end to an era of reckless personal spending.
至少，它让我们从轻易致富和拥有更大房子的狂热梦想中醒来，并为一个不计后果的个人消费时代画上了一个必然的句号。
Constant variations in the amount of sunlight available on Earth at any given location make energy storage a necessary design feature of terrestrial solar-energy systems.
在地球上任何一个特定地点，阳光的不断变化使能量储存成为地球太阳能系统的一个必要设计特征。
The curfew regulation is a temporary expedient made necessary by a sudden emergency.
宵禁令是应对突发事件时必要的临时权宜之举。
Use a kettle with an automatic cut-out so it doesn't boil for longer than necessary.
使用一个有断流器的水壶，这样水开后它会自动断电。
Flippers may indeed be a necessary response to aquatic life, turtles, whales, and dugongs also have them.
鳍状肢可能确实是水生生物的必要反应，海龟、鲸鱼和儒艮也有鳍状肢。
One necessary condition seems to be a somewhat detached view of human problems.
一个必要的条件似乎是某种对人类难题超然客观的看法。
Elliott also said that in order to translate what the aliens are actually saying, it may still be necessary to have a code book.
艾略特还说，为了翻译外星人所说的，可能仍然需要一本密码本。
It's necessary for us to have a thorough discussion with our parents about the meaning of education.
我们有必要与父母深入的讨论教育的意义。
It is necessary that a critic develop a sensibility informed by familiarity with the history of art and aesthetic theory.
批评家必须在熟悉艺术史和美学理论的基础上培养一种感性。
Practice is a necessary step in learning and it will benefit the kids for a life time.
练习是学习的必要步骤，它会使孩子受益终生。
Meanwhile, government spending that would make everyone better off was being cut down because people instinctively—and wrongly—labeled government only as "a necessary evil".
与此同时，本可以让每个人生活更好的政府开支却被削减了，因为人们本能地——且错误地——将政府贴上了“必定邪恶”的标签。
What traffic teaches us is that reckless and uncontrolled change is as likely to harm us as it is to benefit us, and that thoughtful regulation is necessary for a better future.
交通教会我们的是，不计后果、不受控制的变化既可能造福我们，也可能伤害我们，而考虑周到的监管对更美好的未来而言非常必要。
A Burberry spokesperson further said, "On the occasions when disposal of products is necessary, we do so in a responsible manner."
博柏利的一位发言人进一步表示：“在有必要处理产品的情况下，我们是以负责任的方式进行处理的。”
For all that is necessary is to pick up a mitt and get in the game.
对所有人来说都有必要拾起手套，加入这场博弈。
Traditionally, legal learning has been viewed in such institutions as the special preserve of lawyers, rather than a necessary part of the intellectual equipment of an educated person.
按照传统的观点，在这些大学里学习法律一直被看作是律师的专门工作，而不是一个受过良好教育的人所必须具备的知识素养。
And if we keep working toward that goal, someday, perhaps, a list won't be necessary.
如果我们继续朝着这个目标努力，也许有一天，清单就没有存在的必要了。
In short, a good and harmonious environment at home is necessary for a child to grow healthy.
总之，良好和谐的家庭环境对孩子的健康成长至关重要。
He said a foreign language was necessary for a person to have a better future.
他说为了有一个更好的未来，学习一门外语对人们来说是有必要的。
It's necessary to bring a gift.
带礼物是有必要的。
It is necessary for developing a strong working spirit.
培养强烈的劳动精神很有必要。
It is becoming a necessary language skill in the international community.
它正成为国际社会中一种必要的语言技能。
If necessary, just take a deep breath and smile before speaking.
如果有必要，就在说话前深呼吸并微笑。
Many of the chemicals in food are necessary parts of a healthy diet.
食物中的许多化学物质是健康饮食的必要组成部分。
It's not necessary to find a friend who is the same as you.
没有必要找一个和你一样的朋友。
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