diff --git a/.github/workflows/unittest.yml b/.github/workflows/unittest.yml
index 90b49471..e1269cb5 100644
--- a/.github/workflows/unittest.yml
+++ b/.github/workflows/unittest.yml
@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: ${{ github.event_name == 'pull_request' && fromJSON('["ubuntu-latest"]') || fromJSON('["ubuntu-latest", "macos-latest", "windows-latest"]') }}
         python-version: ['3.9']
     steps:
       - uses: actions/checkout@v4
diff --git a/tn/chinese/data/math/operator_unambiguous.tsv b/tn/chinese/data/math/operator_unambiguous.tsv
new file mode 100644
index 00000000..3bef6459
--- /dev/null
+++ b/tn/chinese/data/math/operator_unambiguous.tsv
@@ -0,0 +1,6 @@
+×	乘
+÷	除
+≥	大于等于
+≤	小于等于
+>=	大于等于
+<=	小于等于
diff --git a/tn/chinese/rules/math.py b/tn/chinese/rules/math.py
index ce358bfb..fbc33981 100644
--- a/tn/chinese/rules/math.py
+++ b/tn/chinese/rules/math.py
@@ -30,10 +30,11 @@ def __init__(self, cardinal=None):
 
     def build_tagger(self):
         operator = string_file(get_abs_path("chinese/data/math/operator.tsv"))
+        unambiguous_operator = string_file(get_abs_path("chinese/data/math/operator_unambiguous.tsv"))
         symbols = cross("~", "到") | cross(":", "比") | cross("<", "小于") | cross(">", "大于")
 
         number = self.cardinal.number
         tagger = number + (delete(" ").ques + (operator | symbols) + delete(" ").ques + number).star
-        tagger |= operator
+        tagger |= unambiguous_operator
         tagger = insert('value: "') + tagger + insert('"')
         self.tagger = self.add_tokens(tagger)