to combine efforts with others for a purpose
与他人合作以达成目的 (yu taren hezuo yi dacheng mudi)
"Companies join forces for developing sustainable packaging."
"公司联合起来开发可持续包装。" (Gongsi lianhe qilai kaifa kexu packaging.)
when the sky becomes covered with clouds
to have difficulty choosing between two options
to refer to something in the past as a cause or source
to rain very heavily
to stay updated with online work or communication
to continue discussions or resist giving in during talks
