The problem is that competition ordinarily cannot be observed directly but must be inferred from the spread or increase of one species and the concurrent reduction or disappearance of another species.
问题是，人们通常不能直接观察竞争，而必须从一个物种的扩展或增加和同时另一个物种的减少或消失来推断。
Broken line kite, although freely, but must be planted fields to soon.
断了线的风筝，虽然无拘无束，但一定会很快栽下地来。
Therefore, they cannot be accessed directly, but must be moved in through DMA.
因而，它们不能被直接访问，而必须通过DMA 移进来。
A quark cannot exist on its own, but must be bound to other quarks or an antiquark.
一个夸克不能单独存在，必须与其它夸克或反夸克结合在一起。
The leaves and stem can be used in cooking for flavor, but must be removed before eating.
茎和叶可以用作烹饪调味品，但必须在食用前去除。
Time can not prove that a lot of things, but must be able to see through a lot of things.
时间不一定能证明很多东西，但一定能看透很多东西。
Tickets for the exhibition are free but must be booked in advance by calling 020 7239 9993.
本次展览的门票是免费的，但需要提前拨打电话020 7239 9993预订。
Sarcomas are uncommon at this site, but must be distinguished from other types of neoplasms.
这个部位发生肉瘤不常见，但必须与别的类型的肿瘤区别。
A texture's width and height can be different, but must be powers of 2, such as 128 in Figure 1.
纹理的宽和高可有所不同，但必须是2的幂，如图1中的128。
The warning notices near the river have not just been put up for fun but must be taken seriously.
河边竖起的警告牌可不是闹着玩的，必须认真对待。
Don't have to do a beautiful woman, don't have to do is elegant woman, but must be a feminine woman!
不必做漂亮的女人，不必做高雅的女人，但一定要做个有女人味的女人！
Places on the ladder must not be taken ipso facto but must be interpreted with theprecautions above.
阶梯上的位置决不能采取依事实上，但必须解释与防范以上。
Investigation from a web page is also ok, but must be to book review, not the content nor the Introduction.
从网页上查的也行，不过一定是要读后感，不是内容也不是简介。
These features are not all enabled by default, but must be configured by the Document Manager administrator (you).
这些特性在默认情况下都是未启用的，必须由DocumentManager管理员（您）进行配置。
The latter one which is about the manipulation of computer is optional but must be included in the final test.
第二部分关于计算机操作，属于选修但其摸考试包括这部分。
Choice of hairstyle, attire, cosmetics and adornment as a matter of personal preference, but must be professional.
选择发型、着装、化妆品和饰品作为个人的表现方式，但是必须是专业的。
A module name or location change is conceptually similar to a class name change but must be handled quite differently.
在概念上，模块的名称或位置的改变类似于类名称的改变，但处理方式却完全不同。
Even slower, almost, longitudinal will lag behind, longitudinal will fail, but must be able to reach his goal oriented.
即使慢，驰而不息，纵会落后，纵会失败，但必须能够到达他所向的目标。
As mentioned, the rights subsisting in a piece of software cannot be waived by its author, but must be transferred or licensed.
正如前面所提到的，作者不能放弃软件中的权利，只能对权利进行转移或许可。
And she added: "A mask can be worn continuously for up to eight to 10 hours, but must be replaced if it is taken off at any stage.
她补充说：“一只口罩持续佩戴可以达8-10个小时，但是期间一旦摘下就必须更换。”
The SOA consumers must not be aware of this underlying heterogeneity but must be able to access the integrated information transparently.
soa使用者不必了解基础异构性，但必须能够透明地访问集成的信息。
Methods inside nonpublic classes that are never actually invoked but must be implemented in order to satisfy the contract of an interface.
非公共类中的一些方法，它们永远也不会被实际调用，只是为了满足某个接口契约而必须实现。
"Patterns are fun, but must be executed in the right way," Babvani says. "Petite full-figured women should try smaller prints, as they do not overwhelm the frame."
“图案很有趣味，但是必须以合适的方式来搭配衣物，”巴巴·瓦尼说，“娇小偏胖的女士应该试试小喷绘，因为它们不会压垮你的身型。”
There is an easy to ignore but must be reminded that the back surface of the water, which is mainly aimed at the building near the external walls of the unit users.
还有一个大家容易忽视但又须分外提示的是背水面(屋顶)防水，这重要是针对靠近建筑外墙的单元的用户。
The code we provide allows you to create a "fake" monitor set that has the full functionality of a monitor set, but must be created through the ordinary business item editor.
我们提供的代码可以允许您创建一个“伪”监测集，它具备监测集的完整功能，但必须通过普通业务项目编辑器来创建它。
A candidate cannot package himself in debates the way he can in party advertisements but must be quick on his feet3 to respond to unanticipated4 questions and criticisms, he adds.
他还补充说，在辩论中，候选人不能够像在制作本党竞选广告那样包装自己，而必须迅速对事先毫无准备的问题和批评做出回答。
She was already sure that he must be Peter, but it did seem a comparatively short name.
她已经知道，他一定是彼得，但相比之下，这个名字似乎有点短。
She was already sure that he must be Peter, but it did seem a comparatively short name.
她已经知道，他一定是彼得，但相比之下，这个名字似乎有点短。
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