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easterly (adj.) + noun
形容词用法，放在名词前，表示方向位于或朝向东方。
The ship set an easterly course.
船定下了一条向东的航线。
东方的；向东的
先理解核心含义，再看它在真实句子里的用法。
东方的；向东的
lying in or toward the east
The ship set an easterly course.
船定下了一条向东的航线。
面向东方的；朝东的。
Facing the east; directed towards the east.
位于东方或偏东的。
Located towards or in the east.
从东方来的。
Coming from the east.
The easterly wind brought cold air from the sea.
东风从海上带来了冷空气。
We took the easterly road out of town.
我们走了出城向东的那条路。
The plane flew easterly across the ocean.
飞机向东飞越大洋。
形容词用法，放在名词前，表示方向位于或朝向东方。
The ship set an easterly course.
船定下了一条向东的航线。
形容词用法，作表语，指风从东方吹来。
The wind was easterly, bringing cold air from the sea.
风是从东边吹来的，从海上带来了冷空气。
副词用法，修饰动词，表示风从东方吹来。
The wind blew easterly all night.
风从东边吹了一整夜。
Not this
The wind is blowing eastward.
Use this
The wind is blowing easterly.
表示风从东面吹来时，应用 easterly；eastward 表示朝东的方向，与风的来向相反。
Not this
The wind comes from easterly.
Use this
The wind comes from the east.
介词 from 后接名词或代词，easterly 是形容词/副词，不能作介词宾语；表示“从东边”应使用名词短语 the east。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
东风；从东方吹来的风
An easterly wind brought rain to the coast.
一阵东风给海岸带来了降雨。
向东的方向
The ship continued in an easterly direction.
船继续向东行驶。
偏东气流；从东面流动的气流
A steady easterly flow kept temperatures low.
持续的偏东气流使气温保持偏低。
东风大风；强劲的东风
The forecast warned of an easterly gale overnight.
天气预报警告夜间会有东风大风。
从东面吹来；刮东风
The wind is likely to blow easterly tomorrow.
明天可能会刮东风。
Use easterly naturally, then get feedback on meaning, tone, grammar, and phrasing.
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easterly里藏着east，指向东或从东吹来的风；联想复活节(Easter)早晨太阳从东方升起。
语域：neutral 常见场景：气象/风、方向/地理 easterly 作形容词时通常表示“向东的”或“从东来的”，多用于描述风、气流或地理方位；作副词时表示“向东”。这一用法比较常见于书面或气象语境，日常口语中更常用 eastward 或 from the east。
easterlies
Dictionary facts from ECDICT, WIKTIONARY.