a.

1. 人工的，人造的；假的
   The room was decorated with artificial flowers.

   房间用人造花装饰。

2. 矫揉造作的，不自然的
   Her artificial manner made me sick.

   她那装腔作势的样子令我恶心。

3. 人为的

adj.

1. made as a copy of something natural.
2. contrived or false:
   the artificial division of people into age groups.
   ▸insincere or affected.
3. Bridge  (of a bid) conventional as opposed to natural.