🧩 词语组成解析
serious
['sɪrɪəs]
adj. 严肃的，严重的;认真的，庄重的;重要的;危险的;
🗣️ 情景例句
and how hard it is
他还说这件事很难
Please call me if you have any problems.
如果你有难题，就请打电话给我吧。
While early settlers had killed bison for food, now the killing became more widespread.
早期的殖民者只是以杀野牛为食，这时屠宰野牛就更为广泛了。