对HECU最大障碍就是黑山研究所一个叫戈登弗里曼的研究员。
The greatest obstacle to the Hazardous Environment Combat Unit was a Black Mesa research associate named Gordon Freeman.
虽然当前在黑山研究所的XEN生物开始减少，可是一群新的被称为“X族”的生物开始他们自己的入侵。
Although the presence of Xen creatures in Black Mesa began to decline, a new group of creatures known as 'Race X' commenced their own invasion of the facility.
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