英语语法分析

This procedure may not be effective on large prostates. Its long-term effectiveness is unknown.

然而，这种方法在肿块较大时可能不是那么有效，并且其长期效果至今未知。

Objective to find out the need of the patients with chronic prostates for health education and to put forward the effective method and necessary content of health education.

目的了解慢性前列腺炎患者健康教育需求，并提出行之有效的健康教育方法和内容。