5. It is necessary to improve the packaging.
改進(jìn)包裝方法十分必要。
還能這樣說(shuō)：
Improving the packaging is necessary.
It is necessary to make the packing better.
應(yīng)用解析：
improve abilities 提高能力；
improve one's time 善用時(shí)間；
improve in health 改善健康

6. We have a big demand for this product.
關(guān)于這類產(chǎn)品我們有很大的需求量。
還能這樣說(shuō)：
We need to a big deal of this product.
There is a great demand for this product.
應(yīng)用解析：
have many demands on one's time 時(shí)間不夠支配；
in great demand 需要量很大

7. Our toys are lacked variety.
我們的玩具太單一。
還能這樣說(shuō)：
Our toys are too simple.
We don't have various toys.
應(yīng)用解析：
a variety of 各種各樣的，種類繁多的；
every variety of form 各種形式

8. Manufactures are interested in technical improvements.
生產(chǎn)廠商對(duì)技術(shù)改進(jìn)很感興趣。
還能這樣說(shuō)：
Manufactures are fond of the technical improvements.
Manufactures take a great interest in improving the technology.
應(yīng)用解析：
bear interest 產(chǎn)生利息；提供利息；
give back with interest 連利息一起償還某人；加倍還擊某人