diff --git a/content/18.safety.md b/content/18.safety.md
index c0ea156c836e3295f88e5e59c2317b600ff10385..a93f86db6722c66c6a3395997aadcc8892f0cb51 100644
--- a/content/18.safety.md
+++ b/content/18.safety.md
@@ -55,11 +55,11 @@ At the beginning, Peking 2023 conducted a four-day laboratory professional train
 
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-At the beginning of the project, Peking 2023 intended to select VNP20009 (a strain of *Salmonella*) as our chassis due to its high affinity to tumor tissues. However, it is modified by a pathogenic bacterium, which is not conducive to our experimental operation and future applications.
+At the beginning of the project, Peking 2023 intended to select VNP20009 (a strain of *Salmonella*) as our chassis due to its high affinity to tumour tissues. However, it is modified by a pathogenic bacterium, which is not conducive to our experimental operation and future applications.
 
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-Therefore, we chose *Escherichia coli* Nissle 1917 (EcN) as the main microbial chassis. EcN is considered a non-pathogenic strain of *E. coli* and is often used as a probiotic. Many microbial therapies use EcN as a chassis. Peking 2023 hopes to make EcN obtain tumor affinity close to VNP20009 through precise AND gate design.
+Therefore, we chose *Escherichia coli* Nissle 1917 (EcN) as the main microbial chassis. EcN is considered a non-pathogenic strain of *E. coli* and is often used as a probiotic. Many microbial therapies use EcN as a chassis. Peking 2023 hopes to make EcN obtain tumour affinity close to VNP20009 through precise AND gate design.
 
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