溜溜球既可以上升也可以下降。
Someone may walk upon it, and fall.
有人可能会踩在上面跌倒。
Each year red-winged blackbirds stop in a certain region of Midland Province on their spring and fall migration.
每年春天和秋天，红翼黑鹂都会在米德兰省的某个地区停留。
She watched the gentle rise and fall of his chest as he slept.
她看着他睡着时微微起伏的胸膛。
It's important to tighten up the wheels properly, otherwise they vibrate loose and fall off.
把车轮拧紧很重要，否则它们会振动而松脱。
In autumn, quite a few leaves turn yellow and fall off the trees.
在秋天，很多树叶变黄并从树上落下。
They mix with ice in the air and fall to the ground as snow.
它们与空气中的冰混合，然后以雪的形式落在地上。
Last summer, when Chinese people fought the flood in the South, Beidou helped measure the rise and fall of the flood water.
去年夏天，当中国人民在南方抗洪时，北斗帮助测量了洪水的涨落。
When the babies see the keepers, they run over with excitement and some of them even walk into their friends and fall over!
当宝宝们看到饲养员时，它们兴奋地跑过来，其中一些甚至撞到它们的朋友们，摔倒了！
One of the first features of language a child learns well is to control the rise and fall of the voice to make the difference between stating and questioning.
孩子学好语言的第一个特征就是控制声音的升降，从而区分陈述和疑问。
They drink too much and fall asleep.
他们喝太多而睡著了。
波浪此起彼伏。
Diseased teeth can cause pain, die and fall out.
龋齿会疼痛、死亡，然后脱落。
In autumn the leaves wither and fall off the trees.
秋天，树叶枯萎并从树上落下来。
If you go surfing, you will rise and fall with the waves.
如果你去冲浪，你会随波浪起伏。
The roofs arch and swoop and fall, mimicking the region's mountains.
屋顶呈弧形猛扑而下，模拟着这个地区的山脉。
During autumn, the leaves change color and fall down from the trees.
在秋天，树叶变了颜色，从树上掉下来。
Some day the whole house will break to pieces and fall on top of us.
总有一天，整个房子会倒塌，压在我们身上。
Egyptian life basically revolved around the mysterious rise and fall of the river.
埃及人的生活基本上是围绕着这条河的神秘涨落而展开的。
Niagara Waterfalls are 670 metres in width and fall 56 metres in an awesome sheet of water.
尼亚加拉瀑布宽670米，白色水幕飞流直下56米，令人叹为观止。
We all need to forgive others, because we all stumble and fall and require help from others after failure.
我们都需要谅解他人，因为我们都会犯错、跌到，并在失败后寻求他人的帮助。
The things people make, and the way they make them, determine how cities grow and decline, and influence how empires rise and fall.
人们制造的东西及其制造方式决定了城市的兴衰，也影响着帝国的隆替。
The mountain ranges rise and fall.
山峦起伏。
Cadence means the rise and fall of the voice in reading with rhythm.
顿挫抑扬是形容朗读时声音的高低曲折和和谐的的节奏。
I think New York is best in spring and fall.
我想春天和秋天的纽约是最好的。
Spring and fall, when the weather is better.
最佳探访时间：春季和秋季，这时气候会好一点。
I think New York is the best in spring and fall.
我想春天和秋天的纽约是最好的。
Also, do you ever lose your balance and fall?
还有，你是否曾经失去平衡摔倒过？
Summer and fall look like the safest seasons.
而在夏秋季节最不易出现分手。
Summer and fall look like the safest seasons.
而在夏秋季节最不易出现分手。
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