中文：

增发是指增加头发的数量和密度，以达到更好的头发外观和健康状态。头发稀疏或脱发是许多人面临的问题，而增发可以有效地解决这些问题。

增发有两种主要方式：手术和非手术。手术增发包括将自身或其他人的头发移植到稀疏或秃顶的部位，这种方法可以永久性地增加头发的数量和密度。非手术增发包括使用药物、营养品、生发剂等，这些方法可以促进头发的生长并增加头发的密度，但通常不会永久性地增加头发的数量。

增发的成本因方法和地区而异。手术增发通常需要数千元甚至数万元，而非手术增发的成本通常较低。在选择增发方法时，应该考虑自己的需求和预算，并选择合适的增发方法。

总的来说，增发是一种有效的解决头发稀疏或脱发问题的方法。如果你对自己的头发外观不满意或正在经历脱发问题，可以考虑咨询专业的医生或美容师，了解适合自己的增发方法。

英文：

Hair thickening refers to increasing the quantity and density of hair to achieve a better hair appearance and healthier condition. Thinning or balding hair is a problem that many people face, and hair thickening can effectively solve these problems.

There are two main ways to hair thickening: surgical and non-surgical. Surgical hair thickening includes transplanting one's own or other people's hair to the sparse or balding areas, which can permanently increase the quantity and density of hair. Non-surgical hair thickening includes using drugs, nutritional supplements, hair growth agents, etc., which can promote hair growth and increase hair density, but usually do not permanently increase the quantity of hair.

The cost of hair thickening varies depending on the method and region. Surgical hair transplantation usually costs several thousand or even tens of thousands of dollars, while non-surgical hair thickening usually has a lower cost. When choosing a hair thickening method, one should consider their needs and budget and choose the appropriate method.

Overall, hair thickening is an effective way to solve problems such as thinning or balding hair. If you are not satisfied with your hair appearance or experiencing hair loss issues, you can consider consulting a professional doctor or beautician to find the right hair thickening method for you.