名词
中文翻译：髓在茎中
同义词：
['core', 'heartwood', "sapwood例句：1. The tree's trunk is filled with a hard coreof wood.（这棵树的树干里充满了坚硬的木质。）2. The sapwood is softer and more flexible than the heartwood.（心材比韧皮部更硬、更结实。）3. The heartwood is where thetree stores its energy reserves.（心材是树木储存能量的地方。）"]
例句：
-
1. The tree's trunk is filled with a hard coreof wood.
这棵树的树干里充满了坚硬的木质。
-
2. The sapwood is softer and more flexible than the heartwood.
心材比韧皮部更硬、更结实。
-
3. The heartwood is where thetree stores its energy reserves.
心材是树木储存能量的地方。