diff --git a/src/Dictionary.cs b/src/Dictionary.cs
index 82c17b9..6e4d64b 100644
--- a/src/Dictionary.cs
+++ b/src/Dictionary.cs
@@ -151,8 +151,9 @@ private List<Result> DetailedQuery(Query query)
                 results.Add(MakeResultItem("Definition", word.definition.Replace("\n", "; "), "d"));
             if (word.exchange != "")
                 results.Add(MakeResultItem("Exchanges", word.exchange, "e"));
-            results.Add(MakeResultItem("Synonym", String.Join("; ", synonyms.Query(word.word)), "s"));
-
+            var synonymsResult = String.Join("; ", synonyms.Query(word.word));
+            if (synonymsResult != "")
+                results.Add(MakeResultItem("Synonym", synonymsResult, "s"));
             return results;
         }
 
diff --git a/src/Downloader.cs b/src/Downloader.cs
new file mode 100644
index 0000000..0aecc19
--- /dev/null
+++ b/src/Downloader.cs
@@ -0,0 +1,51 @@
+using SevenZip;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Net;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace Dictionary
+{
+    class Downloader
+    {
+        const string URL = "https://coding.net/u/nullptr_t/p/ECDICT-sqlite/git/raw/master/ecdict.7z";
+        string rootPath;
+
+        public Downloader(string rootPath)
+        {
+            this.rootPath = rootPath;
+        }
+
+        public void Download()
+        {
+            if (!File.Exists(rootPath + "dicts\\dict.7z.tmp"))
+            {
+                WebClient webClient = new WebClient();
+                webClient.DownloadFileCompleted += WebClient_DownloadFileCompleted;
+                webClient.DownloadFileAsync(new Uri(URL), rootPath + "dicts\\dict.7z.tmp");
+            }
+            else
+            {
+                Decompress7Zip(rootPath + "dicts\\", "dict.7z.tmp");
+                File.Delete(rootPath + "dicts\\dict.7z.tmp");
+            }
+        }
+
+        private void WebClient_DownloadFileCompleted(object sender, System.ComponentModel.AsyncCompletedEventArgs e)
+        {
+            Decompress7Zip(rootPath + "dicts\\", "dict.7z.tmp");
+            File.Delete(rootPath + "dicts\\dict.7z.tmp");
+        }
+
+        private void Decompress7Zip(string path, string fileName)
+        {
+            SevenZipExtractor.SetLibraryPath("7zxa.dll");
+            new SevenZipExtractor(path + fileName).ExtractArchive(path);
+            MessageBox.Show("Download successfully", "Download successfully. Restart Wox to apply. 下载成功！请重启 Wox 来使用词典。");
+        }
+    }
+}