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1·We propose an implicit discretization for the level set equation of the model and solve it using additive operator splitting scheme (AOS).

本文提出，首先，将该模型对应的水平集方程做隐式数值化，然后采用加性算子分割方法(AOS)求解。

2·(Note: the slash is the choice operator, i.e. the additive is either an two operands separated by a plus character or just the result of the multitive rule).

(注意：这个斜杠是选择操作符，意思是，additive规则要么是两个操作数和之间的加号，要么是multitive规则的结果)。