首先，本项目比一开始可能听上去的要容易得多。
This project is a lot easier than it probably sounded at first.
从一开始；开始；起初；首先。
一开始水面下降的原因是瓶子首先变热，于是它变得稍稍大了一些。
The reason why the water level went down at first is that the bottle became hot first and so it became a little bigger.
一开始水面下降的原因是瓶子首先变热，于是它变得稍稍大了一些。
The reason why the water level went down at first is that the bottle became hot first and so it became a little bigger.
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