  
  build/_build/html/d2l-zh.zip: $(OBJ) $(DEPS)
  	cd build; zip -r $(patsubst build/%, %, $@ $(DEPS)) chapter*
  
  # Copy everything to build/.
  build/%: %
  	@mkdir -p $(@D)
  	@cp -r $< $@
  
  html: $(DEPS) $(FRONTPAGE_DEP) $(OBJ)
 
</s> remove ORIGIN_DEPS = $(IMG_NOTEBOOK) $(wildcard data/*) environment.yml README.md
 </s> add ORIGIN_DEPS = $(IMG_NOTEBOOK) $(wildcard data/* gluonbook/*) environment.yml README.md
# Copy XX to build/XX if build/XX is depended (e.g., $(DEPS))
  
  build/_build/html/d2l-zh.zip: $(OBJ) $(DEPS)
  	cd build; zip -r $(patsubst build/%, %, $@ $(DEPS)) chapter*
  
# Copy XX to build/XX if build/XX is depended (e.g., $(DEPS))
  build/%: %
  	@mkdir -p $(@D)
  	@cp -r $< $@
  
  html: $(DEPS) $(FRONTPAGE_DEP) $(OBJ)
keep keep keep keep replace keep keep keep keep keep
 cp gluonbook in Makefile, add load_timemachine in gb 
Makefile