An external factor, for example, might be that the product is already oldand useless by the time it is developed; that is, it is based on out-of-date technology that makes the product cumbersome to use.
An external factor, for example, might be that the product is already oldand useless by the time it is developed; that is, it is based on out-of-date technology that makes the product cumbersome to use.
例如，外部因素可能是产品开发出来时，已经过于陈旧而且没什么价值了，也就是说，过时的技术导致产品难于使用（可用性很差）。