Here is the revised version with grammar and stylistic improvements, maintaining the original format and content structure:

**In the 20th century, labor protection shoes witnessed a remarkable qualitative leap due to the rapid development of materials science and manufacturing technology. This era saw the emergence of advanced protection technologies, which significantly enhanced the safety features of these shoes.**

### Advancements in Protection Technologies
Advanced protection technologies such as steel toes, composite anti-smashing shoe toes, anti-puncture midsoles, and anti-slip outsoles emerged one after another. These technologies enabled labor protection shoes to provide comprehensive, multi-level protection for workers. For instance, the anti-smashing function is one of the most fundamental and crucial features. In industries like construction and machinery manufacturing, where falling heavy objects pose common risks, shoe toes made of steel or composite materials offer exceptional compressive and impact-resistant capabilities. When heavy objects fall, these materials quickly disperse impact forces, preventing serious toe injuries. A brick falling from height at a construction site could cause toe fractures or even amputation without adequate protection. Qualified anti-smashing labor protection shoes substantially mitigate such risks.

### Diverse Types of Labor Protection Shoes
The types of labor protection shoes also diversified significantly during the 20th century. To address varying working environments and needs, specialized designs were developed. Anti-static shoes became essential in electronics manufacturing where static electricity poses hazards. Insulating shoes protect against electric shocks in electrical work. Acid-and-alkali-resistant shoes serve workers in chemical industries. Safety shoes featuring toe protection and puncture prevention incorporate additional functionalities like impact resistance and enhanced anti-slip features.

### Materials Selection for Labor Protection Shoes
Regarding materials selection, safety shoe soles primarily utilize rubber, plastic, rubber-plastic composites, polyurethane, and natural leather. When purchasing labor protection shoes, inspecting sole quality is critical. The outsole should be smooth with clearly defined tread patterns. Pressing the sole gently with a fingernail should reveal adequate elasticity – neither excessively hard nor prone to flaking. Failure to meet these standards indicates low rubber content and excessive recycled rubber filler, resulting in brittle soles with reduced durability.

### Proper Use and Maintenance
Safety shoes are engineered to protect feet from occupational hazards. Selection should correspond to specific workplace risks. Products must include certification and usage instructions. Workers should thoroughly review documentation before use and adhere to operational guidelines. Specialized protective safety shoes require post-use inspection and cleaning, followed by storage in dry, contaminant-free environments.

**In conclusion, the 20th century brought significant advancements to labor protection shoes regarding types, functions, and materials selection. These improvements have substantially enhanced worker safety across various industries.**

Key improvements made:
1. Hyphenation consistency (e.g., “anti-smashing” instead of “anti – smashing”)
2. Sentence restructuring for clarity (e.g., “where falling heavy objects pose common risks”)
3. Terminology precision (“midsoles” instead of “mid-soles”)
4. Improved transitions (“Regarding materials selection…” vs “When it comes to…”)
5. Active voice implementation (“Products must include certification…”)
6. Technical accuracy (“prone to flaking” vs “peel off”)
7. Removal of redundancy (streamlined materials list)
8. Enhanced professional terminology (“mitigate such risks” vs “minimize such risks”)
9. Corrected spacing issues (“anti-slip” vs “anti – slip”)
10. Improved parallel structure in specialized shoe descriptions