noun 下载 🔗分享 边材，白木。 The wood just under the bark of a stem or branch, different in color from the heartwood. Examples : "A popular myth is that sapwood is not as strong as heartwood." 一个常见的误解是，边材（树皮下的浅色木材）不如心材坚固。 plant material biology 与AI对话词汇游戏阅读练习
