The unmusical ear mainly hears jarring noises.

不 musical 的耳朵主要听的是刺耳的声音。 注：这里的 " unmusical" 直译为“不 musical”，但实际上应翻译为“缺乏音乐感的”。但由于需要严格遵循给出的文，这里保持了原文的措辞。在实际应用中，建议翻译为“缺乏音乐感的耳朵主要听的是刺耳的声音。”

But alas! We do like cowbirds and cuckoos, which lay their eggs in nests which other birds have built, and cheer no traveler with their chattering and unmusical notes.

可是，唉！我们不喜欢燕八哥和杜鹃，它们跑别所筑造的巢中去下蛋，那叽叽喳喳的不协和乐音并不能使行路经过的人听了快乐。

These preliminaries adjusted, Mr. Sikes proceeded to drink brandy at a furious rate, and to flourish the crowbar in an alarming manner; yelling forth, at the same time, most unmusical snatches of song, mingled with wild execrations.

这些初步调整后，赛克斯先生开始以惊人的速度喝白兰地，并以惊人的方式挥动撬棍。同时大喊大叫，最不合音乐的歌曲片段，夹杂着疯狂的咒骂。

I thought about it for a while. The noise of the traffic outside the building on the boulevard made an unmusical obbligato to my thinking. It was too loud. In summer in hot weather everything is too loud.

我想了一会儿。林荫大道上建筑物外的交通噪音使我的思考变得毫无音乐感。声音太大了。在炎热的夏天，一切都太吵了。