diff --git a/templates/list.html b/templates/list.html
index c802bba..51528f9 100644
--- a/templates/list.html
+++ b/templates/list.html
@@ -285,7 +285,7 @@
             <div class="col-sm-9">
               <select class="custom-select" name="year">
                 <option selected>不详/不适用</option>
-                {% for y in range(curr_year, curr_year-10, -1) %}
+                {% for y in range(curr_year, curr_year-20, -1) %}
                 <option value="{{y}}">{{y}}</option>
                 {% endfor %}
               </select>
@@ -407,7 +407,7 @@
             <div class="card-body">
               {% for y, count in all_years %}
               <span class="cate {{'selected' if y==year else ''}}">
-                <a href="?year={{'' if y==year else y}}#part2">{{y or '/'}}</a>
+                <a href="?year={{'' if y==year else y}}#part2">{{y or '不详'}}</a>
                 <span class="count">({{count}})</span>
               </span>
               </span>
@@ -441,7 +441,7 @@
         {% endif %}
         <h5>{{p.course}}</h5>
         <p class="ml-3">
-          {{p.teacher}} - {{p.year or '/'}}
+          {{p.teacher}} - {{p.year or '不详'}}
         </p>
         <pre class="ml-3">{{p.notes}}</pre>
         <div class="text-right">