get half track的意思|示意

He added: "Knowing that they need nine-and-a-half hours' sleep, you should track that back from when they get up and make sure their room is dark with no TV on from then."

他补充道：“既然知道他们需要九个半小时的睡眠，你们就应该从他们起床的时间往回推算，确保在那个时间，他们的房间关了电视是黑的。”

By the start of last year, Nigeria was home to half of the world's 1,600 polio cases. The sultan could help get the campaign back on track.

截至去年年初，全球1,600例小儿麻痹症病例中有一半发生在尼日利亚。这名苏丹能使这场战役重回正轨。