答案是未知的，但惠特默说，研究人员正计划在后续研究中找出答案。
The answer is unknown, but Whitmer says researchers are planning a follow-up study to find out.
默多克说：“收费计划正有条不稳的进行，在正式实施前有大量的工作要做。”
"It's a work in progress and there's a huge amount of work going on, " Murdoch said.
收音机里关于货船在大西洋被德国U型潜艇击沉的消息满天飞，爱德华·R·默罗不时从伦敦发来报道，那里正遭受德国空袭。
The radio was full of news of freighters on the Atlantic being sunk by U-boats, and crackly transmissions from Edward R. Murrow reported on London under siege by the Luftwaffe.
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