半衰期2系列
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Half-Life 2 series means the following games:
注意:
半衰期2：第一章, 
半衰期2：第二章 and 
半衰期2：失落的海岸线 are part of 半衰期2 since Anniversary update
Many entities available in Half-Life 2 series are also available in 
传送门.