They looked unnaturally white, that day, those birds. The waves were depositing a fringe of soiled yellow foam along the waterline. No sail marred the high horizon.

那天，这些海鸟看起来异乎寻常的白。海浪沿着水岸线留下了一条黄色的脏泡沫带。远处，看不见航船。

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The high-memory waterline refers to the highest memory footprint of an application during a certain period.

一开始不太懂这个waterline到底指的什么，根据这句理解是程序运行中的内存峰值。

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As we move forward, I glimpse a handful of fabulous chateaux poking out from between the trees high above the waterline.

BBC: Swiss movement