9年级ESL因果表达练习：图书馆试行报告

因果与谨慎措辞：社团任务

Invented club pilot report: 20 volunteers tried a new checklist. Most said the instructions were clearer. No comparison group was used, and task difficulty varied. A coordinator recommends a further trial. A participant notes that the checklist took extra time. These statements concern a limited pilot, not every learner.

因果与谨慎措辞：花园任务

Invented garden pilot report: 10 volunteers tried a new checklist. Most said the instructions were clearer. No comparison group was used, and task difficulty varied. A coordinator recommends a further trial. A participant notes that the checklist took extra time. These statements concern a limited pilot, not every learner.

因果与谨慎措辞：工作坊任务

Invented workshop pilot report: 25 volunteers tried a new checklist. Most said the instructions were clearer. No comparison group was used, and task difficulty varied. A coordinator recommends a further trial. A participant notes that the checklist took extra time. These statements concern a limited pilot, not every learner.

更安静的教室

虚构的练习数据或情境，并非真实研究报告。

In a fictional class, the room became quieter after a soft rug was added and a new discussion routine began. The teacher noted the change during one week. Both changes happened together. The report gives no separate record for the rug alone or the routine alone, so it does not show which change caused the difference.