However '-' can't be typed by pressing numeric keys.

然而' - '不能输入按数字键。

youdao

Tip: The returned array will have numeric keys, starting at 0 and increase by 1.

提示：返回的数组将拥有数值键，从0开始以基数1递增。

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Note: String keys will be maintained, but numeric keys will be re-indexed, starting at 0 and increase by 1.

注意：默认使用字符串键，如果要使用数值键则需要重新指定，且从“0”开始以基数“1”递增。

youdao

Ideal for creating and enjoying content on the go, the Series 5 550P features a full-size keyboard with isolated numeric and direction keys and an improved touchpad with separated left and right clicks.

ENGADGET: Samsung outs new Series 5 550P notebook in the UK, Ivy Bridge and numeric keypad onboard

Actually, it's more accurate to say that it's 95 percent BlackJack and 5 percent improvement, with a more inward-slanted, square d-pad that makes it considerably harder to accidentally hit the surrounding controls, and angled keys that offer an embedded numeric pad in the proper configuration (we appreciate what Samsung tried to do with the original BlackJack's every-other-key layout, but in practice, it just didn't work out).

ENGADGET: Hands-on with the Samsung ACE Mobile