diff --git a/src/contents/safety.tsx b/src/contents/safety.tsx
index 9e02e00e2cb6fa116ee87ca3c4bddc8491bb078e..262d2a7bd4d577acd5da387610c473914f3d2295 100644
--- a/src/contents/safety.tsx
+++ b/src/contents/safety.tsx
@@ -89,6 +89,7 @@ The next page details the security measures and considerations our team has take
                 <p className="indent">Escherichia coli Nissle 1917 is an oral probiotic commonly used to treat various gastrointestinal diseases, including diarrhea, ulcerative colitis, etc.</p>
                 <h3>2.2Parts Safety</h3>
                 <h3>2.3Suicidal System</h3>
+                <p className="indent">From both environmental and human health protection perspectives, the design of the safety module aims to detect environmental variations inside and outside the human body, such as temperature and oxygen concentration, to induce bacterial death. This ensures that the bacteria do not cause environmental pollution after being expelled.</p>
                 <h3>2.4Safety Module</h3>
                 <p className="indent">Conversely, there is a risk of excessive proliferation of the engineered E. coli within the human body, necessitating the development of controllable switches to regulate bacterial growth and death effectively. </p>
                 <p className="indent">Additionally, we recognize that abdominal infections are a significant cause of recurrent hepatic encephalopathy and can lead to death. In response, we aim to develop an engineered bacterium capable of resisting inflammation and repairing the intestinal barrier. </p>