All three of these cheng yu mean to get two for one, they have slight stylistic differences, which are reflected in their literal meanings.
一简双雕yi1 jian4 shuang1 diao1 to shoot down a pair of golden eagles: i.e. planned effective dual action.
一石二鸟yi1 shi2 er4 niao3 to kill two birds with one stone
一举两得yi1 ju3 liang3 de2 lit. raise one torch get two
口译 kou3 yi4 interpreters
积极ji1ji4 to amass+extreme=actively
运动yun4dong4 movement
决定权jue2 ding4 quan2 decisional right
恒 heng2 eternal
危机wei2ji1 crisis
蔓延man4yan2 extend (lit vine+spread widely)
引发yin3fa1 trigger （lit. pull+release)
潮chao2 wave
违约wei2yue1 default (lit. violate+ appointment)
应对ying4dui4 respond (lit. echo-toward)
Chinese characters are simplified standardized pictures and symbols. Start with the single simple pictograms they are pictures of literal objects. Which perspective have I? Am I looking at it from the front, the side, or the top?
Different pictures can be reused to depict different things.
After teaching pictograms and ideograms then the hui yi zi. Teach pictophonetic characters last. There are around 2000 pictograms ideograms and huiyizi all together so “just” teaching that is already a lot and it is the basis of all the pictophonetic characters.
Make a story up about the character. Can you impersonate the character with your body? Pretend the character is an object, can you turn it round, move it, build it? Some characters are easy to find on the body they should be first so 口 耳 others like 是 are easy conceptually but tough visually — do them LAST.
Start with the simplest most concrete characters first. Save the abstract and complicated characters for last.
Use different colors to represent tones. Draw the character in RED if it is FOURTH tone
In GREEN if it is SECOND tone
in GOLD if it is FIRST TONE
In PURPLE if it is THIRD TONE. This makes the character more memorable.