low water mark的用法和样例：
例句
- The boat was pointing and leaning sharply along the water line.
小船迎风航行，船体沿着水位线严重倾斜。 - Above the water table, ancient caverns abandoned by the river slowly fill up with stalactites and stalagmites.
在地下水位线，远古洞穴溢满的河水中充斥着石笋和钟乳石。
词汇搭配
- be at low-water mark 手头拮据
