effective tiller

例句：

1. 1. Thenew policy is expected to be effective inreducing pollution.
   新政策预计将有效减少污染。
2. 2.The medicine is effective against the common cold.
   这种药对普通感冒有效。
3. 3. The manager's leadership style is effective in inspiringteamwork.
   经理的领导风格在激发团队合作方面是有效的。