effective column length

例句：

1. 1.The new policy is expected to be effective in reducing pollution.
   预计新政策能有效减少污染。
2. 2.Her advice was very effective at solving the problem.
   她的建议在解决这个问题上非常有效。
3. 3.The new software is effective at handling large amounts of data.
   这款软件在处理大量数据时非常有效。