public static String formatThousand(int amount, boolean isUseTraditional) {
		Assert.checkBetween(amount, -999, 999, "Number support only: (-999 ~ 999)！");

		final String chinese = thousandToChinese(amount, isUseTraditional);
		if (amount < 20 && amount >= 10) {
			// "十一"而非"一十一"
			return chinese.substring(1);
		}
		return chinese;
	}
@Test
	public void formatThousandTest() {
		String f = NumberChineseFormatter.formatThousand(10, false);
		assertEquals("十", f);
		f = NumberChineseFormatter.formatThousand(11, false);
		assertEquals("十一", f);
		f = NumberChineseFormatter.formatThousand(19, false);
		assertEquals("十九", f);
	}