只有在实行过程中出现未遇见的情况时才可能需要修改或扩充项目。
Unforeseen developments that become apparent only in the course of implementation may require the amendment or extension of projects.
外接式附件就是为提高性能或扩充存储器而外接到计算机上的硬件。
Add-ons are hardwares attached to a computer to merease performance or memory.
在PPE上，这样做的结果并不太坏，因为值不过是被截断或扩充了而已。
On the PPE that isn't so bad, as the value is merely truncated or expanded.
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