[译] 当地外出时，我帮她保管银行存折。
[误] I helped to take care of her saving accounts while she was away.

[正] I helped to take care of her savings accounts while she was away.
[注] 在 savings account（存折）、savings bank（储蓄银行）、savings deposit（储蓄金）等词语中，savings 均用复数形式。