If you are hoping to form a new relationship tread carefully and slowly to begin with.

如果你希望建立一种新的关系，开始时就要小心缓慢行事。

《柯林斯英汉双解大词典》

The idea of permanently inserting new genes into cells has generated great hopes in the past few decades, but it is a risky path to tread.

向细胞输入永久新基因，这一想法在过去的几十年都带来了巨大希望，但实施风险太大。

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When a product has to tread in a new path, many development aspects are often overlooked, leading to incorrect effort estimates.

当产品需要进行新的升级时，有许多开发方面常常会被忽视，进而导致不正确的任务和工作量估计。

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The new head, William Donaldson, a former chairman of the New York Stock Exchange, will need to tread more deftly.

ECONOMIST: American insurance

However, a new breed of stateside man is boldly going where only dandies once dared to tread.

WSJ: Men's Sock Options��Beyond Stripes

India will focus on aiding the democratic transition in Nepal, for example, but it will tread a fine line between preserving its influence there and pushing the new Maoist-dominated government into China's arms.

ECONOMIST: As India's clout grows it will reshape the world around it