请将以上改写后的句子转成英语，最好每个改写用两种含有不同词汇的句子

Many people believe that private companies are more efficient than state-owned businesses. Some individuals hold the view that privately owned enterprises operate with higher efficiency.

Many find computer manuals difficult to comprehend. Some individuals encounter challenges when trying to grasp the content of computer manuals.

Research suggests that, in most cases, older students perform better at university. Some studies indicate that students of a higher age often excel academically in university.

Some argue that exploring space is a squandering of precious resources. There are opinions stating that the pursuit of space exploration consumes valuable resources.

Numerous individuals perceive English pronunciation as perplexing. Certain people find it complex to navigate through the intricacies of English pronunciation.

Scientific research indicates that global warming will lead to a rise in sea level. According to scientific studies, global warming has the potential to result in an increase in the Earth's sea level.

Some people believe that students studying science subjects exert more effort compared to those pursuing humanities. There is a belief that students in the scientific disciplines tend to dedicate themselves more rigorously to their studies.

Concrete is considered by some as the optimum material for constructing bridges. From certain perspectives, concrete is regarded as the most suitable choice for bridge construction.