forward和forwards有啥区别

　　例句：

　　He eased slowly forwards.

　　他缓缓向前移动。

　　The traffic rolled slowly forwards.

　　车流缓缓地向前挪动。

　　Row upon row of women surged forwards.

　　一排又一排的妇女向前涌去。

　　Emily edged her chair forward.

　　埃米莉把椅子慢慢地向前挪动。

　　She took two paces forward.

　　她向前走了两步。

　　He took two steps forward.

　　他向前走了两步。