not very effective; produce little effect

• 效果不大

not very effective; produce little effect的用法和样例：

例句

1. Advertisements based on these facts have been printed in newspapers and magazines but have not helped much.
   根据这些情况拟定的广告词登载在报纸和杂志上，但是效果不大。
2. If chemical thinning is not sufficiently effective, hand thinning would involve a great deal of labour.
   在化学蔬果效果不大好的时候，人工疏果又牵涉到大量用工。