6 sentences

1. 请对该计划稍加改良。

   qǐng duì gāi jì​huà shāo jiā gǎi​liáng.

   Please make some slight improvements to the plan.

   Source: Dong Chinese Dictionary

2. 这种改良后的水稻品种产量非常高。

   zhè zhǒng gǎi​liáng hòu de shuǐ​dào pǐn​zhǒng chǎn​liàng fēi​cháng gāo.

   This improved rice variety has a very high yield.

   Source: Dong Chinese Dictionary

3. 通过改良种子，农民们实现了粮食增产。

   tōng​guò gǎi​liáng zhǒng​zi, nóng​mín men shí​xiàn le liáng​shi zēng​chǎn.

   By improving seeds, farmers have achieved an increase in grain production.

   Source: Dong Chinese Dictionary

4. 这种新型小麦是经过改良的丰产品种。

   zhè zhǒng xīn​xíng xiǎo​mài shì jīng​guò gǎi​liáng de fēng​chǎn pǐn​zhǒng.

   This new type of wheat is an improved high-yield variety.

   Source: Dong Chinese Dictionary

5. 科学家们成功改良了这种水稻品种，提高了产量。

   kē​xué​jiā men chéng​gōng gǎi​liáng le zhè zhǒng shuǐ​dào pǐn​zhǒng, tí​gāo le chǎn​liàng.

   Scientists have successfully improved this rice variety, resulting in higher yields.

   Source: Dong Chinese Dictionary

6. 我们需要改良旧的行政管理制度。

   wǒ​men xū​yào gǎi​liáng jiù de xíng​zhèng guǎn​lǐ zhì​dù.

   We need to reform the old administrative system.

   Source: Dong Chinese Dictionary