from a donor(捐献者)to the time they can be implanted in the patient, we've got 72 hours at most. So I am always conscious of time. I had one trip last year where I was caught by a hurricane in America. I picked up the stem cells in Providence, Rhode Island, and was meant to fly to Washington then back to London. But when I arrived at the check-in desk at Providence, the lady on the desk said:“Well, I'm really sorry, I've got some bad news for you—there are no flights from Washington.” So I took my box and put it on the desk and I said:“In this box are some stem cells that are urgently needed for a patient—please, please, you've got to get me back to the United Kingdom.” She just dropped everything. She arranged for a flight on a small plane to be held for me, re-routed(改