1 . insecure
S.A. 子口insecure 不牢固over-lapping stitch 駁線
2 . not secure
the foundation of the house is not secure ., 這座房子的地基不牢固.
3 . shaky ground
Their marriage has been on shaky ground ., 他們的婚姻一直不牢固.
4 . no firm
There were no firm foundations for economic recovery ., 經(jīng)濟(jì)復(fù)蘇的基礎(chǔ)并不牢固.