That old man is a door [gate] keeper.
那位老人是看门的。
Therefore stress echocardiography can be used as a gate keeper for coronary angiography.
因此负荷超声心动图试验可被看作是冠脉造影的守门人。
The HKMAO continues to play the role of a 'gate-keeper' to ensure that Mainland authorities at all levels conduct business with the HKSAR in line with this principle .
港澳办继续担当“守门员”的角色，确保内地各级部门按这个原则与香港特区交往。
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