be subject，to 後面接什麼

1、The competitors will be subject to random drug testing.參賽者將要接受隨機藥檢。

2、Prices may be subject to alteration.價格可能會有所變動。

3、Employee appointment to the Council will be subject to a term of probation of 6 months.被任命到理事會的員工將有6個月的見習期。