String enStr = "en", deStr= "de";
String[] projection = {
        _id,
        en_word,
        de_word};

String selection = "translate_id = ?" + " AND "
                + "en_id = ?" + " AND "
                + "de_id = ? ";
String[] selectionArgs = { String.valueOf("1"), "en", "de" };

return new CursorLoader(this,   // Parent activity context
        currentUri,
        projection,             // Columns to include in the resulting Cursor
        selection,              // No selection clause
        selectionArgs,          // No selection arguments
        null);                  // Default sort order

SELECT
_id, en_word, de_word
from
translate, en, de
WHERE
translate_id = 1 AND en_id = ? AND de_id = ?;

String enStr = "en", deStr= "de";
String selection = "translate_id = 1" + " AND "
                + "en_id = " + enStr + " AND "
                + "de_id = ? " + deStr;

return new CursorLoader(this,   // Parent activity context
        currentUri,
        projection,             // Columns to include in the resulting Cursor
        selection,              // No selection clause
        null,          // No selection arguments
        null);                  // Default sort order

SELECT
_id, en_word, de_word
from
translate, en, de
WHERE
translate_id = 1 AND en_id = en AND de_id = de;