You might have a few in a row.

你可能连着几天都很糟糕。

Next time I might be in a rush, it's good to have a few in the bank.

下次我可能有急事，先多敲两下存着吧。

Because current models are bulky, expensive, and require extensive training to operate, most hospitals only have a few in supply.

因为现有的呼吸机模型笨重且昂贵，还需要大量的训练才能安全操作，大部分医院只配备了少量几台呼吸机。