404. That’s an error.

The requested URL /translate_c?depth=1&rurl=translate.google.com&sl=en&sp=nmt4&tl=id&u=http://en.wikipedia.org/wiki/Piston_effect&xid=25657,15700023,15700124,15700149,15700168,15700186,15700190,15700201&usg=ALkJrhjuKwl5547CHIXK0rkjKpsqM9BL4w was not found on this server. That’s all we know.