Here are several sentences using "complete" in different contexts:

1. I need to complete this report by Friday.

2. She has a complete set of first edition books by her favorite author.

3. His answer to the question was incomplete, missing several key points.

4. The form must be filled out completely before submission.

5. To complete your order, please click the 'Submit' button.

6. His lack of experience makes him a completely unsuitable candidate for the job.

Here are several sentences using "region" in different contexts:

1. The Midwest region of the United States is known for its agricultural productivity.

2. The company plans to expand its operations in the Asia-Pacific region.

3. The polar regions are experiencing rapid ice melt due to global warming.

4. The earthquake caused widespread damage throughout the region.

5. This region is famous for its beautiful beaches and coastal landscapes.

Here are several sentences using "shallow" in different contexts:

1. The children were playing in the shallow end of the swimming pool.

2. His criticism of the book seemed rather shallow and uninformed.

3. The roots of this plant are quite shallow, making it easy to transplant.

4. The shallow pan is perfect for baking thin-crust pizzas.

5. His shallow understanding of the subject was evident during the presentation.

6. Some people consider reality TV to be shallow entertainment.

Here are several sentences using "prevent" in different contexts:

1. Regular exercise can help prevent heart disease.

2. The security system is designed to prevent unauthorized access to the building.

3. Wearing sunscreen helps prevent sunburn and skin damage.

4. The company implemented new policies to prevent fraud.

5. The police set up roadblocks to prevent the suspect from escaping.

6. Proper maintenance can prevent many car problems.

7. We need to take action now to prevent further environmental damage.

8. Safety barriers were installed to prevent accidents on the construction site.

9. Good communication can prevent misunderstandings in relationships.

Here are several sentences using "harmony" in different contexts:

3. World leaders met to discuss ways to promote harmony between nations.

4. The couple has lived in harmony for over 50 years of marriage.

5. The team's success comes from the harmony among its members.

6. The garden's design creates a harmony between natural and man-made elements.

7. Living in harmony with nature is an important principle in many indigenous cultures.

8. The company strives to maintain harmony in the workplace by promoting open communication.

"harmony"这个词可以既是可数名词,也是不可数名词,取决于具体的使用语境。

1. 作为不可数名词:

   • 当表示一般意义上的和谐、协调或一致时,通常用作不可数名词。
     例句:
   • There is harmony in their relationship.
   • We should strive for harmony between different cultures.
   • The design of the room creates a sense of harmony.

2. 作为可数名词:

   • 在音乐领域中,表示特定的和声或和弦时,可以用作可数名词。
   • 有时也可以指具体的和谐状态或和谐的安排。
     例句:
   • The composer wrote beautiful harmonies for the choir.
   • There are several harmonies in this musical piece.
   • We need to find new harmonies between economic growth and environmental protection.

总的来说,在日常使用中,"harmony"更常见的是作为不可数名词。但在特定语境下,尤其是在音乐相关的讨论中,它可以作为可数名词使用。