A small boat floated on the surface of the lake.一艘小船漂浮在湖面上。

flock n.(禽、畜等的）群；大量

The flock of swallows flew south for the cold winter.这群燕子飞到南方去度过寒冷的冬天。

The crowd flocked around the movie star.人群聚集在这个电影明星周围。

flourish vi.繁荣，茂盛；健康成长

The orange trees flourished in the sun.橘子树在阳光下长得很茂盛。

fluent adj.流利的，流畅的

This job requires you to be fluent in English and Spanish.这份工作要求你能流利地说英语和西班牙语。

focus n.焦距；（兴趣活动等的）中心

Please adjust the before you look through the telescope.在通过望远镜观察之前，请调整焦距。

The photographer focused the lens and then took the picture.摄影师先对准镜头的焦距，然后再拍照。

forecast n.预测；预报 原谅，饶恕

When asked if he thought we would win, the coach refused to make a forecast.当教练被问及是否认为我们会贏时，他拒绝进行预测。

The weatherman forecasts snow for tomorrow, so bring a warm jacket.天气预报员预报明天有雪，所以带件暖和的外套吧。

forgive vt.原谅，饶恕

Can you ever forgive me for insulting you? I will never do it again.你能原谅我对你的无礼吗？我再也不会那么做了。

format n.模式，格式

The format of Jack's essay was not what the teacher had asked for and so he got a zero for it.杰克论文的格式不符合老师的要求，所以他得了零分。

formula n.公式；规则

We had to learn chemical formulae at school.我们在学校里得学习化学公式。

fountain n.泉水，喷泉

The fountain is lit with colorfiil lights at night.到了晚上，喷泉便被五彩缤纷的灯光照亮了。