In many programming environments it will be possible to check in experimental code in such a way that no one except the author is affected by it.
许多编程环境是允许提交试验性代码的，这种代码除了提交者本人外不会影响任何人。
Similarly, it is not possible to tell if an address field is timely if there is no check against an address Modification Date field.
类似地，如果没有检查一个AddressModificationDate字段，那么就不能说一个地址字段是否是及时的。
Since there are no compile-time checks possible, there are three ways for an observable to check that Observer.update exists.
因为没有编译时期检查机制，有三种方式可以检查observer .update的存在。
No matter how capably we write programs, it is clear front the variety of possible errors that we should check to insure that our modules are coded correctly.
无论我们写程序的能力有多强，从可能出现的各种错误中仍可以看出，应该对程序进行检测以确保模块编码正确。
No matter how capably we write programs, it is clear from the variety of possible errors that we should check to insure that our modules are coded correctly.
无论我们写程序的能力有多强，从可能出现的各种错误中仍可以看出，应该对程序进行检测以确保模块编码正确。
Grab sensor undefined. No movement possible! Check boat position.
传感器不明确，无法移动，检查舟的位置。
Grab sensor undefined. No movement possible! Check boat position.
传感器不明确，无法移动，检查舟的位置。
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