每日翻译： 在一个现代化的城市里，要避免交通阻塞绝非易事。也许一个良好的地铁系统，是减轻交通阻塞的唯一有效方法，可是建设

在一个现代化的城市里，要避免交通阻塞绝非易事。也许一个良好的地铁系统，是减轻交通阻塞的唯一有效方法，可是建设成本十分高。

• In a modern city, avoiding traffic congestion is anything but easy. Perhaps a well-functioning subway system is the only effective way to alleviate traffic jams, but the construction costs are extremely high.
• Escaping traffic jams in a contemporary urban setting is no small feat. It might be that a robust metro system is the sole viable solution to mitigate traffic congestion, albeit with a hefty price tag for its development.
• It's far from simple to prevent traffic snarls in a city that's fully embraced modernization. A comprehensive subway network might be the lone effective measure to ease traffic congestion, yet the expense of its construction is substantial.
• In a city that's at the forefront of modernization, it's not easy to steer clear of traffic gridlock. A high-quality underground rail system could be the only effective means to reduce traffic congestion, but the cost of building it is quite high.
• Navigating a traffic-free path in a city that's at the cutting edge of modernity is a challenge. A well-established metro system might be the only effective strategy to combat traffic jams, but the costs associated with its construction are significant.

优秀译文：

In a modern city, it is not at all easy to avoid traffic jams. Probably, a nice subway system is the only effective means to lessen them, but its cost of construction is extremely high.

• modern city - 现代城市
• avoid - 避免
• traffic jams - 交通堵塞
• effective means - 有效手段
• subway system - 地铁系统
• lessen - 减轻
• construction - 建设
• cost - 成本
• extremely high - 极高

• 否定表达: "it is not at all easy" - 这个表达用来强调某事非常困难或不可能。"at all" 用于加强否定语气。
• 条件状语从句: "if" 通常用于引导条件状语从句，表示在某种情况下会发生的结果。在这个句子中，虽然没有直接使用 "if"，但整个句子表达了一个条件假设。
• 比较级: "the only effective means" - 使用 "only" 强调了地铁系统是唯一有效的解决方法。
• 动名词短语作主语: "to lessen them" - "to lessen" 是一个动名词，用作主语，表示减轻交通堵塞的动作。
• 所有格: "its cost of construction" - 使用 "its" 表示地铁系统的建设成本，这是一个所有格形式。
• 副词: "extremely high" - "extremely" 是一个副词，用来加强形容词 "high" 的程度，表示成本非常高。