onus
n
the onus [sing]
(fml 文) duty or responsibility (for doing sth); burden 职责; 责任; 负担
the onus of bringing up five children 抚养五个孩子的责任
The onus of proof rests/lies with you, ie You must prove what you say. 证明你所言属实的责任在你.
After the accident, all the lines and taps were clearly marked and new people joining the workforce were given a talk on safety before they started work.