4.4.1 Profiling of image-G in textual space
As for image-G in literary discourse，its semantic value is determined by translators'construal imposed on a specific scenario.One key manifesto of construal is that“base”is lexicalized to represent“profile”，which can be defined as conceptual networks structured in terms of conceptual domains required by image-specific semantics.Langacker（1987）declared that，“profile”is the highlighting depicted partial in“base”to some extent.In other words，“profile”is an entity designated by image categories and a focal spot in conceptualization schema.Obviously，“base”is of the utmost requisite in the semantic value of image-G categories，though“base”itself cannot constitute any semantic value of image-G.A consequence of such a claim is that“base”is a latent network composed of cognitive domains which is activated by the interpretation of image-G in textual space.Take an example from the translation of Meng Jiao's poem“A Traveller's Song”（孟郊《游子吟》）：[9]
谁言寸草心，报得三春晖。
Shui yan cuncao xin,baode sanchun hui.
Such kindness as young grass receives(https://www.daowen.com)
From the warm sun can't be repaid.
(Translated by Xu Yuanchong)
The profiling of holistic image-G as artistic conception in the poem is represented by two ideation bases:filial piety and maternal love.One active ideational metaphor is an imaginative way of describing filial piety by referring to inch-long grass which is the same in the depth of love and the other one corresponds to the gentle sunshine.The adoption of two ideational metaphors shows how they are on operation in textual space and how they are enable base and semantics frames to be associated with each other and then to be constructed at conceptual level.To be more specific,the cao(plant)and chunhui(the spring sunshine)frame in ST are mapping in which filial piety and maternal love are conceptualized in terms of sentiment.Inch-long grass and gentle sunshine contain the semantics value of“infinitesimal”and“warmth and kindness”respectively,which are highlighted as the focal spots to manifest image-G:How profound the maternal love is and how humble the filial piety will be.In the English version,the target frame of the two ideational metaphors is rendered into sentiment as“mother's love”and“heart repay”without paraphrasing the source frame of“plant”and“natural attractions”in ST.It can thus be safely assumed that the“profile”of image-G in ST and TT is equally matching,whereas the“base/frame”which presents cognitive context for its“profile”is not alike at all.