docs: CN translation for system_time.rst (v5.0)

docs/en/api-reference/system/system_time.rst

@@ -41,9 +41,9 @@ The RTC timer has the following clock sources:
     - ``Internal {IDF_TARGET_RTC_CLK_FRE} RC oscillator`` (default): Features the lowest Deep-sleep current consumption and no dependence on any external components. However, the frequency stability of this clock source is affected by temperature fluctuations, so time may drift in both Deep-sleep and Light-sleep modes.
 
     :not esp32c2: - ``External 32 kHz crystal``: Requires a 32 kHz crystal to be connected to the {IDF_TARGET_EXT_CRYSTAL_PIN} pins. This source provides a better frequency stability at the expense of a slightly higher (by 1 μA) Deep-sleep current consumption.
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     - ``External 32 kHz oscillator at {IDF_TARGET_EXT_OSC_PIN} pin``: Allows using 32 kHz clock generated by an external circuit. The external clock signal must be connected to the {IDF_TARGET_EXT_OSC_PIN} pin. The amplitude should be less than 1.2 V for sine wave signal and less than 1 V for square wave signal. Common mode voltage should be in the range of 0.1 < Vcm < 0.5xVamp, where Vamp stands for signal amplitude. In this case, the {IDF_TARGET_EXT_OSC_PIN} pin cannot be used as a GPIO pin.
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     - ``Internal {IDF_TARGET_INT_OSC_FRE} oscillator, divided by 256 ({IDF_TARGET_INT_OSC_FRE_DIVIDED})``: Provides better frequency stability than the ``Internal {IDF_TARGET_RTC_CLK_FRE} RC oscillator`` at the expense of a higher (by 5 μA) Deep-sleep current consumption. It also does not require external components.
 
 The choice depends on your requirements for system time accuracy and power consumption in sleep modes. To modify the RTC clock source, set :ref:`CONFIG_RTC_CLK_SRC` in project configuration.