1. so far

例句The scientist is doing experiments no one has so far attempted.

科学家们正在作一项迄今为止没人做过的实验。

2. until now

例句与用法:

1. I never realized I loved you until now.

我至今才意识到我爱你.

2. I was unaware of his existence until now.

现在我才知道有他这麽个人.