feat(sankey): add new strategy `trajectory` for emphasis focus of sankey (#276)

diff --git a/en/option/partial/emphasis-common.md b/en/option/partial/emphasis-common.md
index e4354ac..117dd5b 100644
--- a/en/option/partial/emphasis-common.md
+++ b/en/option/partial/emphasis-common.md
@@ -49,6 +49,11 @@
 + `'relative'` Focus on all ancestor and descendants nodes. (Since `v${version}`)
 {{ /if }}
 
+
+{{ if: ${isSankey} }}
++ `'trajectory'` Focus on all the elements connected to the node or edge in the graph.
+{{ /if }}
+
 **Example: **
 
 {{ if: !${isGeoCoordSys} }}
diff --git a/en/option/series/sankey.md b/en/option/series/sankey.md
index b354e64..81d9c0c 100644
--- a/en/option/series/sankey.md
+++ b/en/option/series/sankey.md
@@ -222,7 +222,8 @@
 ) }}
 
 {{ use: partial-focus-blur-scope(
-    isGraph = true
+    isGraph = true,
+    isSankey = true
 ) }}
 
 {{ use: sankey-state(