If you are unfamiliar with its internal design, the cost of updates can be difficult to estimate.

如果您对现有产品的内部设计并不熟悉，可能很难估计更新成本。

youdao

If you are unfamiliar with its internal design, the cost of updates can be difficult to estimate.

如果您对现有产品的内部设计并不熟悉，可能很难估计更新成本。

youdao