8.to put sth into effect
9.to take effect
drug, anaesthetic +开始见效
The medicine takes effect after about half an hour.这个药大概半小时后起效。
law, policy +生效
The tax cuts take effect on July 1st.减税政策在7月1日开始实施。
The new law will take effect in April 2011.这项新法律将于2011年4月生效。