diff --git a/globals.py b/globals.py
index 56bcd82..322ab31 100644
--- a/globals.py
+++ b/globals.py
@@ -1,6 +1,7 @@
 # simulation.py中的全局变量
 # reservoir basic height
 RESERVOIR_BASIC_HEIGHT = float(250.35)
+PATTERN_TIME_STEP = None # 浮点数
 
 # 实时数据类：element_id和api_query_id对应
 reservoirs_id = {}
@@ -41,7 +42,7 @@ quality_realtime_ids = []
 
 # transmission_frequency的最大值
 transmission_frequency = None
-hydraulic_timestep = None
+hydraulic_timestep = None # 时间字符串
 
 reservoir_liquid_level_non_realtime_ids = []
 tank_liquid_level_non_realtime_ids = []
@@ -51,4 +52,5 @@ source_outflow_non_realtime_ids = []
 pipe_flow_non_realtime_ids = []
 pressure_non_realtime_ids = []
 demand_non_realtime_ids = []
-quality_non_realtime_ids = []
\ No newline at end of file
+quality_non_realtime_ids = []
+