句中的“at”不解,求英语好的朋友给出详解Among almost seven hundred species of bamboo,some are fully grown at less than a foot high.在竹子的近七百个品种中,有的全长成还不到一英尺.而同样一句话的后半句话
Among almost seven hundred species of bamboo, some are fully grown at less than a foot high, while others can grow three feet in twenty-four hours.
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