premature

Compared meaning: happening before the expected or usual time (adjective).

比较义项：时间上早、提前发生（形容词）。

• earliest

  The superlative form of early; used when comparing three or more times or events, meaning first of all, often in fixed phrases like 'at the earliest' or 'the earliest possible time'.

  early 的最高级形式，用于三者及以上的比较，表示“最早”，常见于固定用法如“at the earliest”（尽早）或“the earliest possible time”（尽可能早的时间）。

  Please arrive at the earliest possible time tomorrow morning.

  请在明天早上尽可能早的时间到达。

• early

  The plain, unmarked form; describes something happening near the start of a period, or sooner than expected or usual, with no explicit comparison to another time.

  最基础的原级形式，表示发生在某段时间的开始阶段，或比预期、比平常更早，不涉及与另一个具体时间点的比较。

  He always wakes up early to exercise before breakfast.

  他总是很早起床，在早餐前锻炼。

• earlier

  The comparative form of early; used to compare two times, events, or actions, typically followed by 'than' or understood against an implied reference point.

  early 的比较级形式，用于比较两个时间点或事件，后面常接“than”（比……），或与一个隐含的参照点相比。

  She finished her homework earlier than she usually does.

  她比平时更早完成了作业。

• premature 本词

  Describes something happening or done before the proper, expected, or ready time; often carries a negative sense of being too soon, as with births or hasty decisions.

  表示某事发生或完成的时间早于恰当、预期或准备好的时刻，常带“为时过早”的负面意味，例如早产或仓促做出的决定。

  The doctor said the baby's birth was slightly premature.

  医生说这个婴儿出生得有点早产。

Earliest, early, earlier, and premature all relate to being early. Early is the plain form. Earlier is the comparative, comparing two times. Earliest is the superlative, first among three or more. Premature means too soon, before the proper time, often with a negative sense.

这几个词都表示“早”或“提前”，但语法功能不同：early 是原级，语气中性；earlier 是比较级，用于两者或与某个参照点相比时；earliest 是最高级，用于三者及以上中最早的一个。premature 则强调事情发生得过早、不合时宜，常带负面色彩，例如指早产或过于仓促的决定。