This article introduces the application and effect of flourine surfactant in oil-proof paper.

本文介绍了氟表面活性刑在防纸中的应和果。

I looked where she said to look: under rocks and boards and tarpaper, along paths and in fields.

我到她告诉我的地方找蛇：在岩石、木板、柏纸下，小路上和田野里。

This article introduces the application and effect of flourine surfactant in oil-proof paper.

本文介绍了氟表面活性刑在防纸中的应用和使用效果。

I looked where she said to look: under rocks and boards and tarpaper, along paths and in fields.

我到她告诉我的地方找蛇：在岩石、木板、柏纸下，小路上和田野里。

This article introduces the application and effect of flourine surfactant in oil-proof paper.

绍了氟面活性刑在防纸中的应用和使用效果。

I looked where she said to look: under rocks and boards and tarpaper, along paths and in fields.

我到她告诉我的地方找蛇：在岩石、木板、柏纸下，小路上和田野里。

This article introduces the application and effect of flourine surfactant in oil-proof paper.

本文介绍了氟表面活性纸中的应用和使用效果。

I looked where she said to look: under rocks and boards and tarpaper, along paths and in fields.

我到她告诉我的地方找蛇：岩石、木板、柏纸下，小路上和田野里。

This article introduces the application and effect of flourine surfactant in oil-proof paper.

本文介绍了氟表面活性刑在防纸中的应用和使用效果。

I looked where she said to look: under rocks and boards and tarpaper, along paths and in fields.

我诉我的地方找蛇：在岩石、木板、柏纸下，小路上和田野里。

This article introduces the application and effect of flourine surfactant in oil-proof paper.

本文介绍了氟表面活性刑纸中的应用和使用效果。

I looked where she said to look: under rocks and boards and tarpaper, along paths and in fields.

我到她告诉我的地方找蛇：岩石、木板、柏纸下，小路上和田野里。

This article introduces the application and effect of flourine surfactant in oil-proof paper.

本文介绍了氟表面活性刑在防纸中的应用和使用效果。

I looked where she said to look: under rocks and boards and tarpaper, along paths and in fields.

我到她告诉我的地方找蛇：在岩石、木板、柏纸下，小路上和田野里。

This article introduces the application and effect of flourine surfactant in oil-proof paper.

本文介绍了氟表面活性刑在防中的应用和使用效果。

I looked where she said to look: under rocks and boards and tarpaper, along paths and in fields.

我到她告诉我的地方找蛇：在岩石、木、，小路上和田野里。

This article introduces the application and effect of flourine surfactant in oil-proof paper.

本文介绍了氟表面活性刑在防中的应用和使用效果。

I looked where she said to look: under rocks and boards and tarpaper, along paths and in fields.

我到她告诉我的地方找蛇：在岩石、木、，小路上和田野里。

This article introduces the application and effect of flourine surfactant in oil-proof paper.

本文介绍了氟表面活刑在防纸中的应用和使用效。

I looked where she said to look: under rocks and boards and tarpaper, along paths and in fields.

她告诉的地方找蛇：在岩石、木板、柏纸下，小路上和田野里。