如何将预言家的make_future_dataframe与多个回归变量一起使用？

from fbprophet import Prophet
import pandas as pd

model = Prophet()

df = pd.DataFrame()
df['ds'] = [date1, date2, ...]  # 日期数据
df['y'] = [value1, value2, ...]  # 目标变量数据

regression_vars = pd.DataFrame()
regression_vars['var1'] = [var1_value1, var1_value2, ...]  # 回归变量1数据
regression_vars['var2'] = [var2_value1, var2_value2, ...]  # 回归变量2数据
...

for var in regression_vars.columns:
    model.add_regressor(var)

model.fit(df)

future = model.make_future_dataframe(periods=num_days)  # 预测未来的时间范围，num_days为需要预测的天数

future = pd.concat([future, regression_vars], axis=1)

forecast = model.predict(future)