mast a ship/vessel
此义为及物动词，宾语通常是船只。
They masted the schooner in the shipyard.
他们在造船厂给这艘纵帆船装上了桅杆。
（树木）大量结果；丰产；采食（树木的）种子或果实；为(船)提供并安装桅杆；以森林种子或果实为食；在某些年份大量结果或结种子,而在其他年份不结果
为(船)提供并安装桅杆
To supply and fit a mast to (a ship).
以森林种子或果实为食
To feed on forest seed or fruit.
在某些年份大量结果或结种子,而在其他年份不结果
To produce a very large quantity of fruit or seed in certain years but not others.
一般现在时
The ship masts a new sail every year.
这艘船每年都会装上新帆。
一般过去时
They masted the boat yesterday.
他们昨天给船装上了桅杆。
现在完成时
The crew has masted the vessel for the race.
船员们已经为比赛给船只装好了桅杆。
规则动词，过去式和过去分词都是masted。
The shipwright masted the restored galleon with a new wooden mast.
造船工匠给修复好的大帆船安装了一根新的木桅杆。
用法提示：“masted”是动词mast的过去式，表示“给……装桅杆”的动作。
The sailing club masts its boats each spring before the first regatta.
帆船俱乐部每年春天在第一场比赛前给船装上桅杆。
用法提示：“masts”是mast的第三人称单数现在时，表示给船安装桅杆的例行做法。
The old vessel was masted and re-rigged for the museum display.
这艘老船被装上桅杆并重新装配了帆索，用于博物馆展出。
用法提示：“was masted”是被动语态，意为“被装上桅杆”。
此义为及物动词，宾语通常是船只。
They masted the schooner in the shipyard.
他们在造船厂给这艘纵帆船装上了桅杆。
此义指动物以林木种子或果实为食，常用 on 引出食物。
Wild boar mast on acorns and beechnuts in autumn.
野猪秋天以橡子和山毛榉坚果为食。
此义为不及物动词，指树木在个别年份大量结果，有明显的大小年之分。
The oaks mast heavily every few years.
这些橡树每隔几年就大量结果。
grammar · medium
易错句子The beech trees mast heavily last autumn.
正确表达The beech trees masted heavily last autumn.
mast 是规则动词，过去式和过去分词都是 masted，表示过去时不能直接用原形 mast。汉语动词本身不随时态变形，所以学习者即使看到 last autumn 这样的过去时间状语，也容易把动词留在原形。
grammar · medium
易错句子This oak mast only every few years.
正确表达This oak masts only every few years.
一般现在时中，主语是第三人称单数时动词要加 -s，写成 masts。汉语动词不随人称和单复数变化，因此学习者常漏掉这个 -s。此句陈述橡树的常年习性，用一般现在时，主语 this oak 为第三人称单数。
grammar · medium
易错句子The old sailing ship was mastered in the shipyard.
正确表达The old sailing ship was masted in the shipyard.
本句要表达的是“给（船）装桅杆”，对应的动词是 mast，其过去分词为 masted；master 意为“掌握、精通、控制”，与“装桅杆”这一语义不符。两词拼写相近，学习者容易多写一个 -er 而选错动词。
给船装桅杆
They masted the ship with new timber.
他们用新木材给船装了桅杆。
大量结果；丰产
The oak trees masted heavily last autumn.
去年秋天橡树大量结果。
以橡子为食
The deer masted on acorns in the forest.
鹿在森林里以橡子为食。
以山毛榉坚果为食
Wild boars mast on beechnuts when they fall.
野猪在山毛榉坚果落下时以它们为食。
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