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我的建议是制作一个小型机器人，买2组6V的镍氢电池组。
My recommendation is to make a small sized robot and buy 2 NiMH 6V battery packs.
youdao
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最好挑选一个电池充电器和一套特优的镍氢电池组。
Pick up a battery recharger and an extra set of NiMH batteries.
youdao
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最好挑选一个电池充电器和一套特优的镍氢电池组。
Pick up a battery recharger and an extra set of NiMH batteries.
youdao