It's hard to keep track of the children's comings and goings.
这些孩子来来往往，很难跟得上他们的行踪。
"These things are notoriously hard to track down," he said.
“这种不名誉的事很难追踪。”他表示。
Having left the fast track, many women find it hard to get back on.
如果以及错过了一班快车，很多女性发现要追回去实在太难。
This made it hard for regulators to keep track of a firm's exposure.
这使得监管人员很难跟踪公司承担的风险。
Eventually, this led to a hard-to-track bug in followpos .
这最终导致难以跟踪followpos中的错误。
It is hard to keep track of all old friends.
与所有老朋友保持联系是很困难的。
Progress in fighting this problem is hard to track.
与这个问题作斗争的进展如何很难确定。
Though at this time of year, they can be hard to track down.
尽管每年的这个时候难以寻觅它们的踪迹。
The grass is soft, but the track is hard.
草地是柔软的，但跑道是硬的。
The grass is soft, but the track is hard.
草地是柔软的，但跑道是硬的。
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