diff --git a/_plugins/number_of_words.rb b/_plugins/number_of_words.rb
new file mode 100644
index 0000000..0c8616f
--- /dev/null
+++ b/_plugins/number_of_words.rb
@@ -0,0 +1,8 @@
+module Jekyll
+  module Filters
+    def number_of_words input
+      cjk_regex = %r!\p{Han}|\p{Katakana}|\p{Hiragana}|\p{Hangul}!
+      input.scan(cjk_regex).length + input.gsub(cjk_regex, ' ').split.length
+    end
+  end
+end
diff --git a/_posts/2019-11-25-rust-wasm-closest-pair.md b/_posts/2019-11-25-rust-wasm-closest-pair.md
index bbb4679..949f66c 100644
--- a/_posts/2019-11-25-rust-wasm-closest-pair.md
+++ b/_posts/2019-11-25-rust-wasm-closest-pair.md
@@ -2,7 +2,6 @@
 title: "Rust + WebAssembly: 最近点对问题"
 description: A Rust + WebAssembly demo of the closest point problem
 toc: true
-read_time: false
 category: Programming
 tags: rust wasm
 redirect_from: /r/2