A cord that is at least five feet long is also good because you're not always going to have a fully charged battery and you won't want to trip people coming into class late.
电源线，至少5英尺长，因为你电池不总充满电，你不会想要绊倒来晚的孩子。
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Caution: With portable vacuums, be aware that the electric cord and the hose are underfoot and can be stepped on or can cause the groom or horse to trip.