This brings us to one of the most contentious limitations when we use Rust traits today, which is known as the coherence problem. To ensure that trait lookups always resolve to a single, unique instance, Rust enforces two key rules on how traits can or cannot be implemented: The first rule states that there cannot be two trait implementations that overlap when instantiated with some concrete type. The second rule states that a trait implementation can only be defined in a crate that owns either the type or the trait. In other words, no orphan instance is allowed.
德国车企不仅在插混领域缺失话语权，在三电系统、智能化方面也有不足之处；但在机械素质、底盘调教和长期品质等方面依然处于领先地位。
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