update aliases; update mr info

data/aliases.yml

@@ -16,3 +16,7 @@ songs:
   小红帽: 109
   乡野整活: 27
   神谕: 213
+  asiantech: 118
+  dandelion: 211
+  take: 192
+  公交车: 193

lib/lyricat/bot.rb

@@ -205,12 +205,12 @@ def gen_multilingual_dynamic_commands name, aliases: [], **opts, &block
 						Calculate the single-chart MR for each chart, \
 						and then for each song, among all its charts (accept Frog Rappa Special), \
 						pick the one with the highest single-chart MR as the single-song MR of the song. \
-						Among songs before 5.0, pick 35 ones (called **b35**) \
+						Among songs before 5.0, pick (at most) 35 ones (called **b35**) \
 						with the highest single-song MRs. \
-						Among songs after 5.0, pick 15 ones (called **b15**) \
+						Among songs after 5.0, pick (at most) 15 ones (called **b15**) \
 						with the highest single-song MRs. \
-						Then, the average single-song MRs of all the 50 songs (called **b50**) \
-						is the total MR of the player.
+						Then, the sum of the single-song MRs of all the (at most) 50 songs \
+						(called **b50**) divided by 50 is the total MR of the player.
 						The calculation of the single-chart MR is as follows:
 						```
 						S' = S / 10000