If you are learning foreign language My Dictionary is good helper for you.
To learn words by heart easily.
My Dictionary - it's your own dictionary.
Add words and phrases. Choose what to study.
You have three display modes which are switched by long pressing on the screen.
1.Show of the word or phrase separately.
2.Show of translation separately.
3.Show of a word or phrase, translation and additional information together.
Change size, color, style.
Send dictionary files to other devices on which it is installed My Dictionary.
You can create and edit dictionary files on a notebook or desktop computer and easily send them to your device.
My Dictionary for Windows 10 (beta):
Download MED.zip
My Dictionary file sharing

Send a file from smartphone to smartphone.
1.You need to enable one smartphone as a Wi-Fi Access Point.
2.On the second smartphone you just need enable Wi-Fi.
IP address of first smartphone in most cases is 192.168.43.1
IP address of the second smartphone will be shown in the settings.
3.Open settings.
4.In the ip address field, enter the address of the smartphone to which you want to send the file.