He estimates the tree is at least 800 years old.
他估计它至少有800年树龄。
He estimates there are as many as 40,000 business angels in Britain alone.
他估计，单是英国就有4万名商业天使。
He estimates his shop has been 40% busier than usual over the past few days.
他估计在过去几天，他的门店比平时忙了40%。
He estimates his shop has been 40% busier than usual over the past few days.
他估计在过去几天，他的门店比平时忙了40%。
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