strengthener
['sreŋθənə]
n. 助力器, 坚固者
例句与用法：
Recent developments lend credit to (ie strengthen belief in) previous reports.
最近的事态发展说明先前的报道是可靠的。
He has been brought in to strengthen the defence.
已请他来加强后卫力量。
The current strengthened as we moved down the river.
我们顺流而下时，水流更急了。
The soldiers strengthened their defenses.
士兵们加强了他们的防御工事。
The wind strengthened during the night.
风在夜间刮得更猛了。
词形变化：
名词: strengthener | 动词过去式: strengthened | 动词过去分词: strengthened | 动词现在分词: strengthening | 动词第三人称单数: strengthens |