如果社会对环境问题一直无动于衷，后果将不堪设想。

Rúguǒ shèhuì duì huánjìng wèntí yìzhí wúdòngyúzhōng, hòuguǒ jiāng bùkānshèxiǎng.

If society remains indifferent to environmental issues, the consequences will be unimaginable.

看到别人遇到困难，他从来不会无动于衷。

Kàndào biérén yùdào kùnnan, tā cónglái bú huì wúdòngyúzhōng.

When he sees others in trouble, he never remains indifferent.

听到这些感人的故事，连平时最冷静的老师也不再无动于衷。

Tīngdào zhèxiē gǎnrén de gùshi, lián píngshí zuì lěngjìng de lǎoshī yě bù zài wúdòngyúzhōng.

After hearing these touching stories, even the usually calm teacher was no longer indifferent.