Wow，把这两行加到 Info.plist 后重启 Emacs 就好了。
diff -u --label /Users/xcy/src/emacs/nextstep/Emacs.app/Contents/Info.plist --label \#\<buffer\ Info.plist\> /Users/xcy/src/emacs/nextstep/Emacs.app/Contents/Info.plist /var/folders/7f/s191h4q97p90374yw15ssrs00000gn/T/buffer-content-4FHTBv
--- /Users/xcy/src/emacs/nextstep/Emacs.app/Contents/Info.plist
+++ #<buffer Info.plist>
@@ -675,5 +675,7 @@
</array>
<key>NSAppleScriptEnabled</key>
<string>YES</string>
+ <key>NSAppleEventsUsageDescription</key>
+ <string>Emacs requires permission to send some event to another application.</string>
</dict>
</plist>
Diff finished. Sun Oct 28 17:41:12 2018