This cell can only be an effective barrier if there's no way to get past it.
这个细胞只有在无法通过时才能成为有效的屏障。
Note that cheques take longer to clear in France than in Britain, and can only be stopped if stolen or lost.
请注意，支票在法国清算的时间比在英国要长，而且只有在被盗或丢失时才能被停用。
Some adjectives can only be used attributively.
有些形容词只能用作定语。
They are still temporizing in the face of what can only be described as a disaster.
眼看着灾难来临，他们还在拖延时间。
You cannot live your children's lives for them; you can only be there to pick up the pieces when things go wrong.
你不能替孩子过活，只能在出现问题时帮忙解决。
Ideas can only be remembered when they are repeated.
观点只有被重复才能被记住。
The answer can only be soccer, the world's most loved sport.
答案只能是世界上最受欢迎的运动——足球。
There are some flowers that can only be pollinated by the humming birds.
有些花只能靠蜂鸟授粉。
Some people think drones can only be used by governments to help when needed.
一些人认为只能由政府在需要的时候使用无人机提供帮助。
Truely fluent language can only be learnt on the ground in the native country.
真正流利的语言只有在本土实地才能学到。
For every object in the call flow, there can only be one other object connected to it.
对于调用流中的每个对象，只能有一个其他对象连接到它。
Does that mean that solar energy can only be used on a small scale, like heating a home?
这是不是意味着太阳能只能在小范围内使用，比如为家庭供暖？
On the one hand, there are tiny microbes and they can only be seen through a microscope.
一方面，有微小的微生物，只有在显微镜下才能看到它们。
The images are so large that they can only be viewed at a height of 1,000 feet—meaning from an aircraft.
这些图像如此之大，以至于只能在1000英尺的高空——也就是说从飞机上观看。
Loch Coruisk on the Isle of Skye, in Scotland, which can only be reached by boat or by foot, completed the top 10.
排在前十名的还有位于苏格兰斯凯岛的科斯克湖，人们只能乘船或步行前往。
Steady progress can only be the result of persistent study.; Only persistent study yields steady progress.
坚持学习，始能不断进步。
messages can only be 140 characters long.
信息最多只能有140个字母。
These limits can only be determined by law.
此等限制仅得由法律规定之。
The family's inner workings can only be guessed at.
这个家庭内部如何运作，外人只能猜测。
They can only be initialized through the constructor.
它们只通过构造函数初始化。
Exception events can only be attached to an activity.
异常事件只能附加到某个活动。
Places can only be claimed by official representatives.
只有官方代理人才能宣布与地点关联。
A prefix can only be associated with one URI at a time.
一个前缀一次只能与一个URI相关联。
This edition can only be licensed using the PVU metric.
此版本仅通过PVU指标来授权。
This option can only be used for database managed tablespace (DMS).
这个选项仅可用于数据库托管表空间（DMS）。
Radiation can only be detected by radiation monitoring devices.
核辐射只能通过放射物监测仪器才能检测到。
Well, that can only be measured in terms of biological fitness.
噢，那只能由生物体的健壮程度来衡量。
But since writing is communication, clarity can only be a virtue.
但是写作是种交流手段，因此清晰绝对是个长处。
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