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The first step is to realise that a trivial solution of x is x = 0, which can be determined from the '4x' denominator. Now zooming in on the numerator and expanding gives us '3x^2 - 18 - 81'. Looking at t...

得 is used to describe how you do the verb generally, whilst 地 is used to describe how the verb is being done at that moment.EG.I am good at swimming uses 得 since it is a general statement.He's swimming so...

When declining an object to a verb which usually takes the accusative but the object is alive (eg. human/animal). If this object is feminine, the animate accusative is simply the accusative.

这是我母亲昨天从伦敦买来的那本书.

Glacier mass balance is a tricky concept to understand without understanding the accumulation and ablation first. Accumulation is when a glacier is gaining mass normally from snowfall which has been compr...