inaudibly

'How warm 'tis to-day! ' she said, almost inaudibly.

“今天天气真热呀！”苔丝说，声音小得像蚊子叫似的。

[Her voice lowers, and she whispers, almost inaudibly. . . ] There are gifts I can bestow that go beyond the material realm.

【她放低了声音，低语着，几乎轻不可闻……】我给予你的礼物是超出了物质领域的。