There are sometimes large-scale evacuations, particularly in the coastal regions of southern China. You should follow the advice of the local authorities. Air travel and other forms of transport can be affected.
1 : to relate to a person or thing The laws pertain to hunting. 2 : to belong to as a part, quality, or function These duties pertain to the office of sheriff.
Learner's definition of ASCERTAIN. [+ object] formal. : to learn or find out (something, such as information or the truth) They were unable to ascertain [=(more commonly) determine] the cause of the fire. The police are now attempting to ascertain his whereabouts. [=to find out where he is] Her doctors have been unable to ascertain [=find out] why she is ill. = Her doctors have been unable to ascertain the cause of her illness.