effective Hall Parameter

例句：

1. 1.The new policy is expected to be effective in reducing emissions.
   预计新政策能有效减少排放。
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 highly effective in boosting morale.
   经理的领导风格在提升士气方面非常有效。